Refactor controller_v2_test.go

[levan-m]

What does this PR do?

Mostly non-functional change:

• Create common test case struct.
• Extracts test execution and some common code (like client creation) into separate function.
• Change helpers to assert instead of returning error.
• Otel test assertion fixes.
• Added focus field to test case to ease debugging of a single test.

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 38.38%. Comparing base (f2d7517) to head (585fa54).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2492      +/-   ##
==========================================
+ Coverage   37.98%   38.38%   +0.39%     
==========================================
  Files         298      299       +1     
  Lines       25029    25413     +384     
==========================================
+ Hits         9508     9754     +246     
- Misses      14796    14920     +124     
- Partials      725      739      +14     

Flag	Coverage Δ
unittests	38.38% <ø> (+0.39%)	⬆️

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see 6 files with indirect coverage changes

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