fix: use number of partitions as parallelism in region scanner

[waynexia]

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What's changed and what's your intention?

🥵 Closes #4668

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

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 84.58%. Comparing base (b52e3c6) to head (7806cd7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4669      +/-   ##
==========================================
- Coverage   84.88%   84.58%   -0.30%     
==========================================
  Files        1105     1105              
  Lines      199151   199157       +6     
==========================================
- Hits       169046   168456     -590     
- Misses      30105    30701     +596     

[v0y4g3r]

LGTM