fix: typo

[killme2008]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

cherry-pick from #4926

What's changed and what's your intention?

Fix typos in comments and function names across multiple modules

• Correct spelling of 'parallelism' in region_server, engine, and scan_region modules
• Amend typo in TODO comment from 'persisent' to 'persistent' in server module
• Update incorrect test query from 'versiona' to 'version' in federated module tests

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.92%. Comparing base (be72d3b) to head (1905b58).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4931      +/-   ##
==========================================
- Coverage   84.16%   83.92%   -0.25%     
==========================================
  Files        1137     1137              
  Lines      210050   210050              
==========================================
- Hits       176796   176281     -515     
- Misses      33254    33769     +515