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.

[codecov]

Codecov Report

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

Project coverage is 68.86%. Comparing base (d0b8863) to head (d0dda55).

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 20 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19155      +/-   ##
==========================================
+ Coverage   68.81%   68.86%   +0.05%     
==========================================
  Files         421      421              
  Lines       35901    35898       -3     
==========================================
+ Hits        24705    24721      +16     
+ Misses       9770     9750      -20     
- Partials     1426     1427       +1     

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[jmhbnz]

LGTM - Thanks @mmorel-35

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jmhbnz, mmorel-35

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