test: flow rebuild

[discord9]

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 some tests related to flow's rebuild. Which will become more useful once flow refill(recover of internal state) is implemented.

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 83.80%. Comparing base (bef6896) to head (7ae2e11).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5162      +/-   ##
==========================================
- Coverage   84.04%   83.80%   -0.24%     
==========================================
  Files        1172     1172              
  Lines      218490   218490              
==========================================
- Hits       183620   183106     -514     
- Misses      34870    35384     +514     

[evenyag]

The test cases should be sufficient. Maybe we can write a fuzz test for this instead of using sqlness to test it.
cc @WenyXu @waynexia