[WIP] pin watchlist to https://github.com/kubernetes/kubernetes/pull/138327

[p0lyn0mial]

run locally against a hacked kube-apiserver and got:

I0420 19:26:36.245779   29019 reflector.go:1096] TRACE-REFLECTOR k8s.io/client-go@v0.0.0-20260420165437-4cff86bf8f9a/tools/cache/reflector.go:343: events=10 total=15.000785417s chanWait=15.000773958s (waiting for events) store=6.583µs (adding to store) other=4.876µs (overhead)
...
I0420 19:26:36.335097   29019 streamwatcher.go:135] TRACE-STREAMWATCHER: events=11 total=15.090105083s network=15.090007086s (read) unmarshal=78.704µs (decode) other=1.002µs (overhead) send=18.291µs (to result chan)

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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