fix: the region_stats API will return an error in instance test

[linyihai]

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?

Fixes #4935

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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[killme2008]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.90%. Comparing base (ac387bd) to head (8761668).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4951      +/-   ##
==========================================
- Coverage   84.15%   83.90%   -0.26%     
==========================================
  Files        1141     1141              
  Lines      211063   211063              
==========================================
- Hits       177616   177083     -533     
- Misses      33447    33980     +533