Streamline KD & QAD transformers Trainers

[AAnoosheh]

What does this PR do?

Type of change: ? Refactor and stabilization

Overview:

• Enforce use of FSDP-2 on KD and QAD trainers in HF plugins/examples so that we can remove multiple restrictions

Usage

# Add a code snippet demonstrating how to use this

Testing

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• Is this change backward compatible?: Yes/No
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.73%. Comparing base (1562dd6) to head (bde5788).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #708      +/-   ##
==========================================
+ Coverage   74.72%   74.73%   +0.01%     
==========================================
  Files         192      192              
  Lines       18833    18870      +37     
==========================================
+ Hits        14073    14103      +30     
- Misses       4760     4767       +7     

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