Fix warning frequency in throughput monitor callback

[GdoongMathew]

What does this PR do?

Fixes #21450

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---

📚 Documentation preview 📚: https://pytorch-lightning--21453.org.readthedocs.build/en/21453/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79%. Comparing base (9df1910) to head (53c1240).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (9df1910) and HEAD (53c1240). Click for more details.

HEAD has 717 uploads less than BASE

Flag	BASE (9df1910)	HEAD (53c1240)
cpu	196	33
python	18	3
lightning_fabric	53	0
pytest	98	0
python3.12	53	9
python3.10	18	3
lightning	90	15
python3.12.7	54	9
python3.11	36	6
python3.13	17	3
pytorch2.2.2	9	3
pytest-full	98	33
pytorch2.8	18	6
pytorch_lightning	53	18
pytorch2.4.1	9	3
pytorch2.1	18	6
pytorch2.7	9	3
pytorch2.6	9	3
pytorch2.3	9	3
pytorch2.9	8	3
pytorch2.5.1	9	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #21453     +/-   ##
=========================================
- Coverage      87%      79%     -8%     
=========================================
  Files         270      267      -3     
  Lines       24059    24006     -53     
=========================================
- Hits        20855    18954   -1901     
- Misses       3204     5052   +1848     

[deependujha]

Please update the changelog too.