Cleanup impl for remove_tmp_snapshot_archives()

[brooksprumo]

Problem

The impl for snapshot_utils::remove_tmp_snapshot_archives() is a bit sus w.r.t. checking if the file name indicates a tmp snapshot archive that should be removed.

Originally brought up in a previous PR here: #32286 (comment)

Summary of Changes

Un-sus it.

[codecov]

Codecov Report

Merging #32297 (fc8ce55) into master (13aff74) will increase coverage by 0.0%.
The diff coverage is n/a.

❗ Current head fc8ce55 differs from pull request most recent head 06f9fa7. Consider uploading reports for the commit 06f9fa7 to get more accurate results

@@           Coverage Diff           @@
##           master   #32297   +/-   ##
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  Coverage    82.0%    82.0%           
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  Files         772      772           
  Lines      209524   209524           
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+ Hits       171985   172007   +22     
+ Misses      37539    37517   -22