MON-3900: Remove prometheus-adapter code

[slashpai]

pkg: remove prometheus-adapter code

• [x] I added CHANGELOG entry for this change.
• [ ] No user facing changes, so no entry in CHANGELOG was needed.

[openshift-ci-robot]

@slashpai: This pull request references MON-3900 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 "4.17.0" version, but no target version was set.

In response to [this](https://github.com/openshift/cluster-monitoring-operator/pull/2409): >pkg: remove prometheus-adapter code > > > >* [x] I added CHANGELOG entry for this change. >* [ ] No user facing changes, so no entry in CHANGELOG was needed. > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-monitoring-operator). 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.

[slashpai]

/skip

[slashpai]

cc @simonpasquier @jan--f @machine424

[slashpai]

/retest-required

[slashpai]

@simonpasquier could you please review again?

[jan--f]

Looks good! Happy to merge when CI and Simon are happy :)

[slashpai]

I will rebase once https://github.com/openshift/cluster-monitoring-operator/pull/2414 is merged to fix generate issue

[openshift-ci[bot]]

@slashpai: all tests passed!

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[jan--f]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jan--f, slashpai

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[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: cluster-monitoring-operator This PR has been included in build cluster-monitoring-operator-container-v4.17.0-202407291514.p0.gf15addc.assembly.stream.el9. All builds following this will include this PR.