[Release-1.28] Add snapshot retention etcd-s3-folder fix

[vitorsavian]

• Issue: [Release-1.28] - Snapshot retention does not work with etcd-s3-folder #10312
• 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 35.67%. Comparing base (7de7adb) to head (3863a36).

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

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.28   #10315      +/-   ##
================================================
- Coverage         42.68%   35.67%   -7.01%     
================================================
  Files               163      160       -3     
  Lines             16632    14052    -2580     
================================================
- Hits               7099     5013    -2086     
+ Misses             8274     8064     -210     
+ Partials           1259      975     -284     

Flag	Coverage Δ
e2etests	35.67% <0.00%> (-10.25%)	⬇️
unittests	?

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