[Backport release-1.31] Applier manager improvements#5171

Merged

twz123 merged 7 commits intorelease-1.31from backport-5062-to-release-1.31

Nov 18, 2024

+369-61

Commits on Oct 29, 2024

The stacks don't need to be stored in the manager struct

twz123
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github-actions[bot]
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Don't check for closed watch channels

twz123
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github-actions[bot]
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Wait for goroutines to exit in applier manager

twz123
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github-actions[bot]
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Improve logging in applier manager

twz123
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Restart applier manager watch loop on errors

twz123
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github-actions[bot]
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Remove unused applier field from applier manager

twz123
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chore: add applier manager test

emosbaugh
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