feat(tests-integration): add a naive region migration integration test

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

1. Fix heartbeat handler ignore upgrade candidate instruction
2. Fix handler did not inject wal options
3. Expose RegionMigrationProcedureTask
4. Add a naive region migration integration test

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

Refer to a related PR or issue link (optional)

#2700

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (2e686fe) 85.47% compared to head (e583f72) 85.19%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3078      +/-   ##
==========================================
- Coverage   85.47%   85.19%   -0.29%     
==========================================
  Files         801      805       +4     
  Lines      129967   130724     +757     
==========================================
+ Hits       111095   111373     +278     
- Misses      18872    19351     +479     

[WenyXu]

@killme2008 PTAL

[killme2008]

LGTM