chore: enable unnecessary-stmt rule from revive

[mmorel-35]

Description

unnecessary-stmt: This rule suggests to remove redundant statements like a break at the end of a case block, for improving the code's readability.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mmorel-35
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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 68.83%. Comparing base (0f172d4) to head (57aec15).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
server/etcdmain/etcd.go	0.00%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/wal/repair.go	55.35% <100.00%> (-0.79%)	⬇️
server/etcdmain/etcd.go	0.00% <0.00%> (ø)

... and 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19155      +/-   ##
==========================================
+ Coverage   68.77%   68.83%   +0.05%     
==========================================
  Files         420      420              
  Lines       35649    35646       -3     
==========================================
+ Hits        24518    24537      +19     
+ Misses       9704     9681      -23     
- Partials     1427     1428       +1     

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