Check milestone latest state and trigger workflow

[khewonc]

What does this PR do?

Check current milestone (as opposed to milestone at PR initial state) and rerun workflow upon milestone/demilestone events

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

Write there any instructions and details you may have to test your PR.

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
• All commits are signed (see: signing commits)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.41%. Comparing base (bdfc654) to head (86f5d82).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2619   +/-   ##
=======================================
  Coverage   38.41%   38.41%           
=======================================
  Files         305      305           
  Lines       26234    26234           
=======================================
  Hits        10077    10077           
  Misses      15398    15398           
  Partials      759      759           

Flag	Coverage Δ
unittests	38.41% <ø> (ø)

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