Safeguard unnecessary DS cleanup

[levan-m]

What does this PR do?

Debugging + add safeguard to avoid cleaning DS if no valid are found

Same as #2239 opened against main branch.

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

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.10%. Comparing base (f4e8de7) to head (73d4885).
⚠️ Report is 296 commits behind head on main.

Files with missing lines	Patch %	Lines
...troller/datadogagent/controller_reconcile_agent.go	77.77%	3 Missing and 1 partial ⚠️
...controller/datadogagent/controller_reconcile_v2.go	0.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (70.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2242      +/-   ##
==========================================
+ Coverage   39.08%   39.10%   +0.01%     
==========================================
  Files         254      254              
  Lines       26307    26322      +15     
==========================================
+ Hits        10282    10293      +11     
- Misses      15412    15415       +3     
- Partials      613      614       +1     

Flag	Coverage Δ
unittests	39.10% <70.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...controller/datadogagent/controller_reconcile_v2.go	57.14% <0.00%> (ø)
...troller/datadogagent/controller_reconcile_agent.go	66.57% <77.77%> (+0.29%)	⬆️

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