Update training_epoch_loop.py

[MirMustafaAli]

pass total_batch_idx for validation check as parameter

What does this PR do?

Fixes #8135

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[codecov]

Codecov Report

Merging #8594 (e7b7739) into master (df16713) will decrease coverage by 48%.
The diff coverage is 0%.

@@           Coverage Diff            @@
##           master   #8594     +/-   ##
========================================
- Coverage      92%     45%    -48%     
========================================
  Files         218     218             
  Lines       14398   14396      -2     
========================================
- Hits        13296    6450   -6846     
- Misses       1102    7946   +6844     

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