Updates snapshot tests to use default archive format

[brooksprumo]

Problem

As of v1.18 (solana-labs#33484), TarZstd and TarLz4 are the only valid snapshot archive formats when creating new snapshots (we still allow loading any format though). It is now safe to remove the code that creates archives in the unsupported formats.

For this PR, tests fail if we remove the unsupported formats when creating snapshots. So update the tests first.

Summary of Changes

Snapshot tests that create snapshots use the default archive format.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.7%. Comparing base (4b0dc70) to head (99fcc83).
⚠️ Report is 3299 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6319   +/-   ##
=======================================
  Coverage    82.7%    82.7%           
=======================================
  Files         845      845           
  Lines      377724   377724           
=======================================
+ Hits       312732   312740    +8     
+ Misses      64992    64984    -8     

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[HaoranYi]

lgtm.