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

[ghost]

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: gudecatch / name: Cuichen (Will) Li (9aacbce, e67d7a4, 9276f65, 60634f3, 3f9afa9, e32edc9, c8a1b4b, c8b2b75, 0e60e06, 8a4432e, 2ecfa4b)
• ✅ login: bogdandrutu / name: Bogdan Drutu (b633680)

[ghost]

the cla has been signed, could you please have a look? thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.04%. Comparing base (6e82944) to head (c8b2b75).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12477   +/-   ##
=======================================
  Coverage   92.04%   92.04%           
=======================================
  Files         470      470           
  Lines       25372    25372           
=======================================
  Hits        23353    23353           
  Misses       1612     1612           
  Partials      407      407           

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[ghost]

looks like easycla still got stuck here

[bogdandrutu]

Please rebase.

[dmitryax]

Done in #12523