[chore][cmd/mdatagen] fix #12298 unit tests failures

[cuichenli]

Description

The current implementation is not working in the sample projects. I reviewed the PR that introduced these changes and found no explanation for them. I believe it’s reasonable to revert these changes, so I’ve created this PR.

Please let me know if I’ve missed anything. Thank you!

Link to tracking issue

Fixes #12298

Testing

$ cd cmd/mdatagen 
$ go install .
$ make generate 
$ git status  # run this to check there is no change in the generated files 
$ make test

Documentation

[cuichenli]

@mx-psi could you please take a look? thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.09%. Comparing base (bf1a374) to head (f22ea62).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12415   +/-   ##
=======================================
  Coverage   92.09%   92.09%           
=======================================
  Files         465      465           
  Lines       25173    25173           
=======================================
  Hits        23184    23184           
  Misses       1592     1592           
  Partials      397      397           

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[cuichenli]

is there anything i can do with this? or maybe someone else can cherry-pick the changes and make another pr to fix the issue? 🤔