ACM-44888: fix non-admin SSE OOM on release-2.16

[Ginxo]

Summary

• Backport SSE RBAC hardening and filter-before-inflate from ACM-44885: Fix non-admin SSE OOM under large inventory #6638 to release-2.16 (ACM-39327 / ACM-44888).
• eventsDefinitions matches the 2.16 watch list (includes PlacementRule; no Authentication or ClusterExtension).

Test plan

• npm run test:backend
• npm run check:backend

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Test name	Commit	Details	Required	Rerun command
ci/prow/pr-image-mirror-mce	457f510	link	true	/test pr-image-mirror-mce
ci/prow/pr-image-mirror	457f510	link	true	/test pr-image-mirror
ci/prow/unit-tests-sonarcloud	457f510	link	true	/test unit-tests-sonarcloud

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