[CASCL-1386] (11/11) Create temporary PodDisruptionBudgets during eviction

[L3n41c]

What does this PR do?

Implements creation and label-based cleanup of temporary PodDisruptionBudgets (maxUnavailable: 1) that protect cross-group workloads during the drain.

Motivation

PR #3026 is too large to review as a single change. This is part 11 of 11 of a stack that splits it into small, individually-reviewable pieces that each build and pass tests on their own. See #3026 for the full feature context and end-to-end QA.

Additional Notes

Stacked PR — the base branch is lenaic/CASCL-1386-evict-10-karpenter-user, not main, so the diff shows only this step's change. Lands last because its controller discovery (discoverControllers) reuses the shouldSkipEviction predicate introduced in part 8. The code is taken verbatim from #3026 (rebased onto main); there are no logic changes versus #3026.

Minimum Agent Versions

N/A — kubectl-datadog plugin only.

Describe your test plan

go test ./cmd/kubectl-datadog/autoscaling/cluster/... passes at this commit. Full end-to-end QA is tracked on #3026.

Checklist

• PR has at least one valid label
• qa/skip-qa label applied (not independently shippable; QA tracked on [CASCL-1386] Add evict-legacy-nodes subcommand to drain non-Datadog node groups #3026)
• All commits are signed

[datadog-official]

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⚠️ Warnings

🚦 3 Pipeline jobs failed

DataDog/datadog-operator | build     

DataDog/datadog-operator | e2e_autoscaling     

validation | build     

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 69.23077% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.57%. Comparing base (e6ebd52) to head (6a978ac).

Files with missing lines	Patch %	Lines
...d/kubectl-datadog/autoscaling/cluster/evict/pdb.go	69.23%	44 Missing and 8 partials ⚠️

Additional details and impacted files

@@                              Coverage Diff                              @@
##           lenaic/CASCL-1386-evict-10-karpenter-user    #3178      +/-   ##
=============================================================================
+ Coverage                                      44.41%   44.57%   +0.15%     
=============================================================================
  Files                                            391      391              
  Lines                                          31316    31483     +167     
=============================================================================
+ Hits                                           13910    14033     +123     
- Misses                                         16508    16544      +36     
- Partials                                         898      906       +8     

Flag	Coverage Δ
unittests	44.57% <69.23%> (+0.15%)	⬆️

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

Files with missing lines	Coverage Δ
...d/kubectl-datadog/autoscaling/cluster/evict/pdb.go	69.00% <69.23%> (+69.00%)	⬆️

... and 1 file with indirect coverage changes

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