Add PodMonitor to supported resources

[WanzenBug]

Description of the change:

Add PodMonitor to supported resources

Motivation for the change:

PodMonitor is a useful resource when monitoring a set of Pods that do not have a dedicated Service resource associated. This is helpful if the only reason to add them to a Service would be to configure monitoring.

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

Closes #1688

[openshift-ci]

Hi @WanzenBug. Thanks for your PR.

I'm waiting for a operator-framework member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[perdasilva]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.27%. Comparing base (3f87bea) to head (58b9221).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1795   +/-   ##
=======================================
  Coverage   55.27%   55.27%           
=======================================
  Files         136      136           
  Lines       15976    15976           
=======================================
  Hits         8830     8830           
  Misses       5991     5991           
  Partials     1155     1155           

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[tmshort]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tmshort

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[perdasilva]

/lgtm