Adding test for legacy checkpoint created with 2.5.2

[pl-ghost]

This is automated addition of created checkpoints with the latest lightning release!

cc @lantiga @Borda

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu-guardian	success	✅

These checks are required after the changes to tests/legacy/back-compatible-versions.txt.

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Thank you for your contribution! 💜

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79%. Comparing base (cb1afbe) to head (57a1bec).
⚠️ Report is 201 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (cb1afbe) and HEAD (57a1bec). Click for more details.

HEAD has 595 uploads less than BASE

Flag	BASE (cb1afbe)	HEAD (57a1bec)
cpu	160	27
python3.10	36	6
lightning_fabric	37	0
pytest	82	0
lightning	90	15
python3.11	36	6
python	18	3
python3.12	18	3
python3.12.7	52	9
gpu	3	0
pytorch2.1	18	6
pytorch_lightning	36	12
pytest-full	81	27
pytorch2.2.2	9	3
pytorch2.3	9	3
pytorch2.5	9	3
pytorch2.7	9	3
pytorch2.6	9	3
pytorch2.4.1	9	3
pytorch2.5.1	9	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #20922     +/-   ##
=========================================
- Coverage      87%      79%     -8%     
=========================================
  Files         268      265      -3     
  Lines       23442    23387     -55     
=========================================
- Hits        20394    18386   -2008     
- Misses       3048     5001   +1953