chore: risedev: clean code to generate config for legacy frontend

[fuyufjh]

I hereby agree to the terms of the Singularity Data, Inc. Contributor License Agreement.

What's changed and what's your intention?

Clean useless code

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

None

[codecov]

Codecov Report

Merging #3497 (ecdc4d4) into main (744f71c) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3497      +/-   ##
==========================================
+ Coverage   74.43%   74.45%   +0.01%     
==========================================
  Files         769      768       -1     
  Lines      107554   107532      -22     
==========================================
- Hits        80060    80059       -1     
+ Misses      27494    27473      -21     

Flag	Coverage Δ
rust	74.45% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/meta/src/manager/id.rs	94.94% <0.00%> (-0.57%)	⬇️
src/connector/src/filesystem/file_common.rs	80.35% <0.00%> (-0.45%)	⬇️
src/common/src/types/ordered_float.rs	24.90% <0.00%> (+0.19%)	⬆️

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more