Detect unexpected errors via logs in envtest and e2e tests

[sbueringer]

It would be great if we find a way to surface unexpected conditions via logs and then check in envtest and e2e tests that they never occur.

Of course this requires us to have an easy way to identify such logs (e.g. they could contain a specific keyword).

Recently we implemented something similar for panics. After envtest and e2e tests are completed we check controller-runtime metrics to ensure no panics occured

[sbueringer]

/triage accepted

But next step is

Of course this requires us to have an easy way to identify such logs (e.g. they could contain a specific keyword).

[sbueringer]

/help

[k8s-ci-robot]

@sbueringer:
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