[bugfix] Revert inference mode support

[ananthsub]

What does this PR do?

Fixes #9431
Reverts #8813 until torchmetrics integration is sorted out

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[codecov]

Codecov Report

Merging #9443 (e5186b5) into master (15434a9) will decrease coverage by 4%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #9443    +/-   ##
=======================================
- Coverage      93%     89%    -4%     
=======================================
  Files         180     180            
  Lines       15046   15041     -5     
=======================================
- Hits        13971   13353   -618     
- Misses       1075    1688   +613