NETOBSERV-1514: drop go1.20 support

[jotak]

I had to upgrade the linter, and took that opportunity to enable more linters (same config as what we have on the agent) But that led to quite a lot of fixes, this is why the PR is pretty big; There's no (intentional) functional changes

[openshift-ci-robot]

@jotak: This pull request references NETOBSERV-1514 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.16.0" version, but no target version was set.

In response to [this](https://github.com/netobserv/flowlogs-pipeline/pull/629): > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=netobserv%2Fflowlogs-pipeline). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.96679% with 57 lines in your changes are missing coverage. Please review.

Project coverage is 67.05%. Comparing base (ddc1f67) to head (382fd38). Report is 2 commits behind head on main.

Files	Patch %	Lines
pkg/pipeline/extract/conntrack/store.go	76.66%	7 Missing :warning:
pkg/api/write_loki.go	16.66%	1 Missing and 4 partials :warning:
pkg/confgen/confgen.go	42.85%	3 Missing and 1 partial :warning:
pkg/pipeline/encode/metrics_common.go	80.95%	4 Missing :warning:
pkg/pipeline/utils/sasl.go	0.00%	4 Missing :warning:
pkg/pipeline/write/write_loki.go	0.00%	4 Missing :warning:
pkg/confgen/extract.go	50.00%	3 Missing :warning:
pkg/pipeline/transform/location/location.go	76.92%	3 Missing :warning:
pkg/test/utils.go	57.14%	3 Missing :warning:
cmd/confgenerator/main.go	50.00%	2 Missing :warning:
... and 15 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #629 +/- ## ========================================== + Coverage 67.02% 67.05% +0.03% ========================================== Files 110 110 Lines 7676 7677 +1 ========================================== + Hits 5145 5148 +3 Misses 2217 2217 + Partials 314 312 -2 ``` | [Flag](https://app.codecov.io/gh/netobserv/flowlogs-pipeline/pull/629/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/netobserv/flowlogs-pipeline/pull/629/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv) | `67.05% <78.96%> (+0.03%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv#carryforward-flags-in-the-pull-request-comment) to find out more.

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[openshift-ci-robot]

@jotak: This pull request references NETOBSERV-1514 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.16.0" version, but no target version was set.

In response to [this](https://github.com/netobserv/flowlogs-pipeline/pull/629): >I had to upgrade the linter, and took that opportunity to enable more linters (same config as what we have on the agent) >But that led to quite a lot of fixes, this is why the PR is pretty big; There's no (intentional) functional changes Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=netobserv%2Fflowlogs-pipeline). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[github-actions[bot]]

New image: quay.io/netobserv/flowlogs-pipeline:d37829b

It will expire after two weeks.

To deploy this build, run from the operator repo, assuming the operator is running:

USER=netobserv VERSION=d37829b make set-flp-image

[github-actions[bot]]

New image: quay.io/netobserv/flowlogs-pipeline:c80abff

It will expire after two weeks.

To deploy this build, run from the operator repo, assuming the operator is running:

USER=netobserv VERSION=c80abff make set-flp-image

[jotak]

/approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jotak

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/netobserv/flowlogs-pipeline/blob/main/OWNERS)~~ [jotak] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment