ci: reduce workflow files by merging actions

[tisonkun]

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?

TRIVIAL AS CHANGES.

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.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 85.30%. Comparing base (81f3007) to head (cf5fb53).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3848      +/-   ##
==========================================
- Coverage   85.60%   85.30%   -0.30%     
==========================================
  Files         954      955       +1     
  Lines      163325   163467     +142     
==========================================
- Hits       139808   139452     -356     
- Misses      23517    24015     +498     

[zyy17]

LGTM

[v0y4g3r]

lgtm