Adding test for legacy checkpoint created with 2.5.1rc2

[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 (2011d5a) to head (2c936dc).
Report is 111 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (2011d5a) and HEAD (2c936dc). Click for more details.

HEAD has 105 uploads less than BASE

Flag	BASE (2011d5a)	HEAD (2c936dc)
cpu	48	24
python	6	3
lightning_fabric	11	0
pytest	27	0
python3.10	12	6
lightning	31	15
python3.11	12	6
python3.12.7	18	9
gpu	3	0

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #20651     +/-   ##
=========================================
- Coverage      88%      79%     -9%     
=========================================
  Files         267      264      -3     
  Lines       23364    23309     -55     
=========================================
- Hits        20467    18354   -2113     
- Misses       2897     4955   +2058