Scope chaos pod watch to stop OOM loops

[aymericDD]

What does this PR do?

Bits AI SRE Investigation • View in Bits AI SRE Investigation

• Adds new functionality
• Alters existing functionality
• Fixes a bug
• Improves documentation or testing

Please briefly describe your changes as well as the motivation behind them:

• Prevents the disruption controller from handling every pod event through an unfiltered raw watch path, which could enqueue non-chaos pods and contribute to high memory usage and OOM crash loops.
• Switches pod event wiring to the namespace-scoped informer from kubeInformerFactory and applies chaosEventsPredicate() directly on that source.
• Adds mapPodToDisruptionRequests so pods missing disruption labels never enqueue reconcile requests, even if predicate behavior changes.
• Adds focused unit tests for pod-to-disruption request mapping and reconcile trigger predicate behavior.

Code Quality Checklist

• The documentation is up to date.
• My code is sufficiently commented and passes continuous integration checks.
• I have signed my commit (see Contributing Docs).

Testing

• I leveraged continuous integration testing
  • by depending on existing unit tests or end-to-end tests.
  • by adding new unit tests or end-to-end tests.
• I manually tested the following steps:
  • go test ./controllers -run 'TestMapPodToDisruptionRequests|TestShouldTriggerReconcile' -count=1
  • GOOS=linux /tmp/bin/golangci-lint run ./controllers
  • locally.
  • as a canary deployment to a cluster.

---

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Bits Dev status: ✅ Done

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🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 39.09% (+0.00%)

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