cache: refactor validateWatch to use a switch for unsupported watch ops

[apullo777]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

@serathius @MadhavJivrajani

[k8s-ci-robot]

Hi @apullo777. 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.

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[serathius]

We should not spend a lot of time on this code as we will just implement the methods in the future.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: apullo777, serathius

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[serathius]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.23%. Comparing base (030ecec) to head (12457c0).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

see 153 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20419      +/-   ##
==========================================
+ Coverage   62.11%   69.23%   +7.12%     
==========================================
  Files         402      416      +14     
  Lines       33559    34696    +1137     
==========================================
+ Hits        20845    24023    +3178     
+ Misses      11155     9285    -1870     
+ Partials     1559     1388     -171     

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