fix(k8s): prevent goroutine leak and deadlock in pod watcher

[vishwas-droid]

Changes

• 🐛 Fixed a critical goroutine leak inside runWithVolumeMounted by making the pod watcher loop context-aware (<-localCtx.Done()).
• 🐛 Prevented potential deadlocks/infinite hangs by introducing an errCh to handle abrupt or unexpected watch channel closures from the Kubernetes API server.
• 🧹 Cleaned up a double type assertion on event.Object to eliminate any sudden runtime panic risks when unexpected object states are encountered.

/kind bug

Release Note

Fixed a potential goroutine leak and deadlock scenario in the Kubernetes pod watcher inside `pkg/k8s`.

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[knative-prow]

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[knative-prow]

Welcome @vishwas-droid! It looks like this is your first PR to knative/func 🎉

[knative-prow]

Hi @vishwas-droid. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[Copilot]

Pull request overview

This PR updates the Kubernetes pod watcher logic in pkg/k8s to avoid goroutine leaks and hangs while waiting for a pod’s container termination state during runWithVolumeMounted.

Changes:

• Made the watcher goroutine context-aware so it can exit promptly on cancellation.
• Added an error channel to surface unexpected watch channel closure from the API server.
• Removed a redundant/dangerous double type assertion on event.Object to reduce panic risk.

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[matejvasek]

/ok-to-test

[vishwas-droid]

@matejvasek Addressed the Copilot suggestion. PTAL.