Keep the minRev between syncWatchers loops

[serathius]

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

[k8s-ci-robot]

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[k8s-ci-robot]

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 68.70%. Comparing base (b038739) to head (c8fee01).

Files with missing lines	Patch %	Lines
server/storage/mvcc/watchable_store.go	33.33%	5 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/mvcc/watchable_store.go	91.50% <33.33%> (-1.44%)	⬇️

... and 19 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18996      +/-   ##
==========================================
- Coverage   68.82%   68.70%   -0.13%     
==========================================
  Files         420      420              
  Lines       35621    35627       +6     
==========================================
- Hits        24517    24476      -41     
- Misses       9683     9718      +35     
- Partials     1421     1433      +12     

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