zalando-incubator / cluster-lifecycle-manager / 30634949683

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Defer git garbage collection to prevent blocking during concurrent syncs

When syncing source for hundreds of clusters concurrently, git automatic
garbage collection (gc.auto) can trigger and block operations, causing the
pod to get stuck. This change disables automatic garbage collection for all
git operations and defers it to run after all updates have completed.

Changes:
- Set gc.auto=0 in all git commands via central cmd() helper to prevent
  automatic gc from blocking during clone, remote update, and checkout
- Add GarbageCollect() method to Git struct for deferred gc execution
- Add optional GarbageCollector interface for config sources
- Update CombinedSource to propagate garbage collection to child sources
- Call GarbageCollect() in controller refresh cycle after all updates
- Add test for garbage collection functionality

This ensures git operations remain non-blocking and garbage collection
happens in batch after all cluster syncs are complete.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Signed-off-by: Noor Malik <noor.malik@zalando.de>

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