Add check for verbose attribute of ModelCheckpoint

[ashleve]

What does this PR do?

Fixes #6408

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[ananthsub]

Please fix the test_model_checkpoint_save_last_warning tests by ensuring that verbose is set for them. You can parameterize verbose for the test to ensure that the warnings are not logged after your change

[codecov]

Codecov Report

Merging #6419 (a200428) into master (e1f5eac) will decrease coverage by 2%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #6419    +/-   ##
=======================================
- Coverage      94%     92%    -2%     
=======================================
  Files         161     161            
  Lines       11497   11497            
=======================================
- Hits        10753   10532   -221     
- Misses        744     965   +221     

[awaelchli]

nice