Disable validation completely when overfit_batches>0

[popfido]

What does this PR do?

Fixes #9989

Does your PR introduce any breaking changes? If yes, please list them.

None

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[codecov]

Codecov Report

Merging #9709 (346ede5) into master (ce0a977) will decrease coverage by 3%.
The diff coverage is 100%.

❗ Current head 346ede5 differs from pull request most recent head c741753. Consider uploading reports for the commit c741753 to get more accurate results

@@           Coverage Diff           @@
##           master   #9709    +/-   ##
=======================================
- Coverage      92%     89%    -3%     
=======================================
  Files         177     179     +2     
  Lines       16290   15813   -477     
=======================================
- Hits        14948   14035   -913     
- Misses       1342    1778   +436     

[rohitgr7]

LGTM!!

[tchaton]

LGTM !

[popfido]

@rohitgr7 One of the test cases on macos is still in timeout, other issues are resolved

[rohitgr7]

@rohitgr7 One of the test cases on macos is still in timeout, other issues are resolved

@popfido don't worry about that.. happens sometimes.