[Release-1.29] Add snapshot retention etcd-s3-folder fix

[vitorsavian]

• Issue: [Release-1.29] - Snapshot retention does not work with etcd-s3-folder #10311
• Bacport from: Add snapshot retention etcd-s3-folder fix #10293

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 43.05%. Comparing base (485eaf3) to head (ee0562f).

Files	Patch %	Lines
pkg/etcd/s3.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.29   #10316      +/-   ##
================================================
- Coverage         50.07%   43.05%   -7.02%     
================================================
  Files               163      163              
  Lines             14204    14205       +1     
================================================
- Hits               7112     6116     -996     
- Misses             5753     6908    +1155     
+ Partials           1339     1181     -158     

Flag	Coverage Δ
e2etests	36.24% <0.00%> (-10.40%)	⬇️
inttests	19.88% <0.00%> (-17.15%)	⬇️
unittests	16.38% <0.00%> (-0.01%)	⬇️

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