test: add fuzz test for metric region migration

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Add fuzz test for metric region migration

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.97%. Comparing base (4f3afb1) to head (abe7169).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4862      +/-   ##
==========================================
- Coverage   84.20%   83.97%   -0.23%     
==========================================
  Files        1136     1137       +1     
  Lines      208582   209140     +558     
==========================================
- Hits       175628   175617      -11     
- Misses      32954    33523     +569     

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[fengjiachun]

LGTM