chore: better column schema check for flow

[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?

adjust flow's column check so that update_at column is only appended when possible, and give a better msg when column is mismatched

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

Attention: Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Project coverage is 83.98%. Comparing base (613e07a) to head (f6f5d3e).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4855      +/-   ##
==========================================
- Coverage   84.30%   83.98%   -0.32%     
==========================================
  Files        1127     1131       +4     
  Lines      208553   208896     +343     
==========================================
- Hits       175814   175442     -372     
- Misses      32739    33454     +715     

[waynexia]

adjust flow's column check so that update_at column is only appended when possible

Do you think it's necessary to describe the "when possible" in document? To my understanding this PR is actually deprecating the update_at information.

[coderabbitai]

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