chore: refactor test setup

[rarguelloF]

Summary of changes:

• Do not use -v flag for tests in the CI: this makes the output extremely verbose which is rarely useful, since the default behavior is to show the verbose output for failed tests only, which is what you are usually interested on.
• Rename trace.Span -> trace.Trace: this should make naming a little less confusing (now ExpectedTraces returns trace.Traces instead of trace.Spans). Clarified in the comment that trace.Trace represents the root span of a trace.
• Change the type of Meta to map[string]string
• Added a new field Metrics and display in a similar way as Meta in the tree.
• Added some verbose logs displaying all the traces / spans received (I found this useful while working on this PR).
• mockAgent.NewSession now runs t.Cleanup for proper test cleanup, so the defer checkTraces call is no longer necessary - I was finding the output of the traces not found assertion not helpful while working on the actual test to work.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.30508% with 4 lines in your changes missing coverage. Please review.

Project coverage is 73.82%. Comparing base (1b1f5aa) to head (d2cd3f9). Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
_integration-tests/validator/trace/diff.go	84.00%	2 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #301 +/- ## ========================================== - Coverage 78.99% 73.82% -5.18% ========================================== Files 143 145 +2 Lines 6738 7986 +1248 ========================================== + Hits 5323 5896 +573 - Misses 984 1659 +675 Partials 431 431 ``` | [Components](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | Coverage Δ | | |---|---|---| | [Generators](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `76.69% <ø> (-1.58%)` | :arrow_down: | | [Instruments](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `88.05% <ø> (ø)` | | | [Go Driver](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `72.81% <ø> (-7.44%)` | :arrow_down: | | [Toolexec Driver](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `70.88% <ø> (-3.42%)` | :arrow_down: | | [Aspects](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `71.95% <ø> (-7.20%)` | :arrow_down: | | [Injector](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `73.42% <ø> (-5.24%)` | :arrow_down: | | [Job Server](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `63.20% <ø> (-5.63%)` | :arrow_down: | | [Integration Test Suite](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `87.82% <98.30%> (-4.82%)` | :arrow_down: | | [Other](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `73.82% <98.30%> (-5.18%)` | :arrow_down: | | [Files with missing lines](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | Coverage Δ | | |---|---|---| | [\_integration-tests/tests/aws.v1/aws.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Faws.v1%2Faws.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2F3cy52MS9hd3MuZ28=) | `94.59% <100.00%> (-5.41%)` | :arrow_down: | | [\_integration-tests/tests/aws.v2/base.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Faws.v2%2Fbase.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2F3cy52Mi9iYXNlLmdv) | `93.87% <100.00%> (-6.13%)` | :arrow_down: | | [...egration-tests/tests/aws.v2/load\_default\_config.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Faws.v2%2Fload_default_config.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2F3cy52Mi9sb2FkX2RlZmF1bHRfY29uZmlnLmdv) | `100.00% <100.00%> (ø)` | | | [\_integration-tests/tests/aws.v2/new\_config.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Faws.v2%2Fnew_config.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2F3cy52Mi9uZXdfY29uZmlnLmdv) | `100.00% <100.00%> (ø)` | | | [\_integration-tests/tests/aws.v2/struct\_literal.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Faws.v2%2Fstruct_literal.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2F3cy52Mi9zdHJ1Y3RfbGl0ZXJhbC5nbw==) | `100.00% <100.00%> (ø)` | | | [...tegration-tests/tests/aws.v2/struct\_literal\_ptr.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Faws.v2%2Fstruct_literal_ptr.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2F3cy52Mi9zdHJ1Y3RfbGl0ZXJhbF9wdHIuZ28=) | `100.00% <100.00%> (ø)` | | | [\_integration-tests/tests/chi.v5/chi.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Fchi.v5%2Fchi.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2NoaS52NS9jaGkuZ28=) | `100.00% <100.00%> (ø)` | | | [\_integration-tests/tests/dd-span/tag.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Fdd-span%2Ftag.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2RkLXNwYW4vdGFnLmdv) | `100.00% <100.00%> (ø)` | | | [\_integration-tests/tests/echo.v4/echo.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Fecho.v4%2Fecho.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2VjaG8udjQvZWNoby5nbw==) | `100.00% <100.00%> (ø)` | | | [\_integration-tests/tests/fiber.v2/fiber.go](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree&filepath=_integration-tests%2Ftests%2Ffiber.v2%2Ffiber.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-X2ludGVncmF0aW9uLXRlc3RzL3Rlc3RzL2ZpYmVyLnYyL2ZpYmVyLmdv) | `100.00% <100.00%> (ø)` | | | ... and [31 more](https://app.codecov.io/gh/DataDog/orchestrion/pull/301?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | | ... and [85 files with indirect coverage changes](https://app.codecov.io/gh/DataDog/orchestrion/pull/301/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog)