Update `dd-trace` gem from `0.x` to `1.x`

[duncanista]

What does this PR do?

Bumps dd-trace to the version 1.x, specifically 1.5.0.

Motivation

The need to use the new version of dd-trace and #64.

Testing Guidelines

Updated integration tests snapshots, also updated the integration tests to use the new API of dd-trace.

Additional Notes

• The new version of dd-trace used, warns an error for the environment logger, which is handled in the integration tests. It's worth mentioning that this only happens when using the writer SyncWriter in the configuration. It seems that it's expected in the future to use the TraceWriter, which doesn't cause to log a warning, but is not yet ready for use. https://github.com/DataDog/dd-trace-rb/issues/2312 which will be fixed in https://github.com/DataDog/dd-trace-rb/pull/2313

• The package size is significantly increased compared to previous releases. This is due the bump on the dd-trace gem and multiple debase-ruby_source_core.

Types of changes

• [ ] Bug fix
• [ ] New feature
• [ ] Breaking change
• [x] Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• [ ] This PR's description is comprehensive
• [ ] This PR contains breaking changes that are documented in the description
• [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
• [ ] This PR's changes are covered by the automated tests
• [ ] This PR collects user input/sensitive content into Datadog