grpcproxy: add support for WatchRequest_ProgressRequest

[alexandrevilain]

Fixes #19710

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @alexandrevilain. Thanks for your PR.

I'm waiting for a etcd-io 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. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[henrybear327]

/ok-to-test

[codecov]

Codecov Report

❌ Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.32%. Comparing base (edfcadc) to head (4dfd84d).

Files with missing lines	Patch %	Lines
server/proxy/grpcproxy/watch.go	61.53%	3 Missing and 2 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
server/proxy/grpcproxy/watcher.go	92.15% <100.00%> (+0.32%)	⬆️
server/proxy/grpcproxy/watch.go	90.72% <61.53%> (-7.07%)	⬇️

... and 25 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19711      +/-   ##
==========================================
+ Coverage   69.25%   69.32%   +0.06%     
==========================================
  Files         422      422              
  Lines       34819    34834      +15     
==========================================
+ Hits        24115    24148      +33     
+ Misses       9314     9299      -15     
+ Partials     1390     1387       -3     

---

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[alexandrevilain]

/retest

[alexandrevilain]

/retest

[alexandrevilain]

Hi!
Can someone please re-review the new implementation ?
Thanks :)

[alexandrevilain]

@serathius Is there something I can do to get this PR merged ?
Thanks :)

[k8s-ci-robot]

@alexandrevilain: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci-etcd-robustness-release36-amd64	63e4f0b	link	true	/test ci-etcd-robustness-release36-amd64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.

[alexandrevilain]

/retest-required