Replaces fs-err in snapshot_utils.rs

[brooksprumo]

Problem

We're trying to remove the fs-err crate. For more information, please refer to #34838.

snapshot_utils.rs still uses fs-err, but doesn't need to.

Summary of Changes

Removes fs_err from snapshot_utils.rs

Each piece is its own commit:

• Replaces fs-err in streaming_snapshot_dir_files()
• Replaces fs-err in serialize_snapshot_data_file_capped()
• Replaces fs-err in create_snapshot_meta_files_for_unarchived_snapshot()
• Replaces fs-err in create_snapshot_data_file_stream()
• Removes fs-err import

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8ff511e) 81.6% compared to head (2b553f5) 81.6%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #34908   +/-   ##
=======================================
  Coverage    81.6%    81.6%           
=======================================
  Files         827      827           
  Lines      223884   223884           
=======================================
+ Hits       182841   182865   +24     
+ Misses      41043    41019   -24     

[HaoranYi]

lgtm