fix unpredictable panoptic_quality output when return_per_class=True

[i-aki-y]

What does this PR do?

Fix #2547

PanopticQuality can return per class score when return_per_class=True argument is given.
But the order of the result is unpredictable.

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

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Make sure you had fun coding 🙃

---

📚 Documentation preview 📚: https://torchmetrics--2548.org.readthedocs.build/en/2548/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36%. Comparing base (8d9d2ae) to head (e4fc7b8).
Report is 100 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (8d9d2ae) and HEAD (e4fc7b8). Click for more details.

HEAD has 168 uploads less than BASE

Flag	BASE (8d9d2ae)	HEAD (e4fc7b8)
Windows	9	3
python3.8	8	2
cpu	58	16
torch1.13.1+cpu	8	3
torch1.12.1+cpu	3	1
Linux	34	12
python3.9	24	8
torch1.11.0+cpu	3	1
torch2.3.0	3	1
macOS	15	1
python3.11	12	3
torch1.10.2+cpu	3	1
torch2.3.0+cpu	9	3
python3.10	14	3
torch2.0.1	6	0
torch2.0.1+cpu	8	3
torch1.13.1	3	0
torch2.2.2+cpu	6	2
torch2.1.2+cpu	3	1
torch2.2.2	3	0

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #2548     +/-   ##
========================================
- Coverage      69%     36%    -33%     
========================================
  Files         314     314             
  Lines       17663   17663             
========================================
- Hits        12179    6334   -5845     
- Misses       5484   11329   +5845     

[Borda]

Pls add entry to the changelog

[i-aki-y]

Added changelog entry.
Updated test codes to add missing test cases.