fix: failed to drain unmanaged clusterqueue

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Which issue(s) this PR fixes:

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[Copilot]

Pull request overview

This PR targets a regression where toggling a node out of management (gpustack.ai/managed=false) would orphan single-node scheduling objects without triggering the expected drain/deletion chain in the worker controllers.

Changes:

• Include systemname.ManagedLabelKey in Node-watch update predicates so managed toggles enqueue reconciles for ResourceFlavors/Cohorts (and related controllers).
• Add unit test cases that guard the “managed=false nodes are excluded from indexes” behavior for ResourceFlavor/Cohort reconcilers.
• Remove the --aggressive-event-filtering manager option/flag and its plumbing.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pkg/worker/controllers/worker/resourceflavor.go	Node-watch predicate now treats managed-label changes as relevant for enqueuing drain logic.
pkg/worker/controllers/worker/resourceflavor_test.go	Adds a case covering unmanaged nodes being excluded by the flavor-profile index (drain expected).
pkg/worker/controllers/worker/nodefeature.go	Simplifies Node update predicate path by removing “aggressive” mode plumbing.
pkg/worker/controllers/worker/cohort.go	Node-watch predicate now treats managed-label changes as relevant for cohort lifecycle.
pkg/worker/controllers/worker/cohort_test.go	Adds a case covering unmanaged nodes being excluded by the cohort-profile index (delete expected).
pkg/worker/controllers/worker/clusterqueue.go	Node-watch predicate now includes managed-label changes in label comparison.
pkg/manager/option.go	Removes AggressiveEventFiltering option and CLI flag definition.
pkg/manager/helper.go	Removes AllowAggressiveEventFiltering() and related state from the manager wrapper.
pkg/manager/config.go	Removes config wiring for aggressive event filtering.
.claude/skills/gpustack-operator-e2e/SKILL.md	Documents an e2e/manual verification flow for managed-toggle draining behavior.