Automatic merge from submit-queue (batch tested with PRs 45125, 45242)

skip procfs-dependent metrics test if not on linux

**What this PR does / why we need it**: #40774 removed build tags on integration tests, which uncovered the fact that a test in `test/integration/metrics` relies on `procfs`. This PR follows the convention used in `pkg/util/procfs` to gate the test on `runtime.GOOS`

**Release note**:
```release-note
NONE
```

/cc @kubernetes/sig-testing-pr-reviews