Stop purging v2 snapshot files

[ahrtr]

part of #20187

We don't generate v2 snapshot files anymore, so no need to purge v2 snapshot files.

[ahrtr]

/test pull-etcd-contrib-mixin

[ahrtr]

cc @fuweid @ivanvc @serathius

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.66%. Comparing base (faafe77) to head (ce48442).

Additional details and impacted files

Files with missing lines	Coverage Δ
server/etcdserver/server.go	84.00% <100.00%> (+0.01%)	⬆️

... and 18 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #22271      +/-   ##
==========================================
- Coverage   69.71%   69.66%   -0.06%     
==========================================
  Files         449      449              
  Lines       38187    38182       -5     
==========================================
- Hits        26622    26599      -23     
- Misses      10141    10151      +10     
- Partials     1424     1432       +8     

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[kubernetes-prow]

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