K8s shutdown timeout may prevent PEM graceful shutdown from completing.

[sync-by-unito[bot]]

Kubernetes has a graceful termination time limit. This time limit may be too low for a pem shutdown to complete. We should:

1. Try to characterize how long it takes to shutdown a PEM, e.g. marginal cost in time per uprobe & kprobe.
2. Pick a better K8s timeout and update yamls.
3. Add a test.

┆Issue is synchronized with this Jira Bug by Unito