throw MegatronOptimizerModule warning only with mcore models

[akoumpa]

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[BoxiangW]

LGTM thanks

[github-actions]

[🤖]: Hi @akoumpa 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.42%. Comparing base (fdfeafe) to head (1fabae2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12085   +/-   ##
=======================================
  Coverage   30.42%   30.42%           
=======================================
  Files        1400     1400           
  Lines      177452   177453    +1     
  Branches    27196    27197    +1     
=======================================
+ Hits        53990    53994    +4     
+ Misses     119345   119341    -4     
- Partials     4117     4118    +1     

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