[bundle] add openmetrics check annotation

[celenechang]

What does this PR do?

Add annotation to configure Openmetrics check on Datadog Operator pod when deployed with OLM.

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Deploy Datadog Operator with OLM
Deploy a minimal DatadogAgent manifest
Check the agent status output that datadog.operator.* metrics are being collected
Check the web app to confirm metrics are reporting

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.55%. Comparing base (6b0c7bd) to head (eaac9b4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1174   +/-   ##
=======================================
  Coverage   59.55%   59.55%           
=======================================
  Files         174      174           
  Lines       21559    21559           
=======================================
  Hits        12839    12839           
  Misses       7941     7941           
  Partials      779      779           

Flag	Coverage Δ
unittests	59.55% <ø> (ø)

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