Progress bar now handles steps_per_execution.

[hertschuh]

Progress bar would always report the starting batch + 1 at the end of the batch. Now it takes into account steps_per_execution for the last batch reported.

Fixes #20861

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.10638% with 7 lines in your changes missing coverage. Please review.

Project coverage is 82.72%. Comparing base (3a11132) to head (dda0634).

Files with missing lines	Patch %	Lines
keras/src/backend/openvino/trainer.py	0.00%	3 Missing ⚠️
keras/src/backend/jax/trainer.py	90.00%	0 Missing and 1 partial ⚠️
keras/src/backend/numpy/trainer.py	85.71%	0 Missing and 1 partial ⚠️
keras/src/backend/tensorflow/trainer.py	90.00%	0 Missing and 1 partial ⚠️
keras/src/trainers/trainer.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21422   +/-   ##
=======================================
  Coverage   82.72%   82.72%           
=======================================
  Files         565      565           
  Lines       55222    55222           
  Branches     8609     8609           
=======================================
  Hits        45683    45683           
  Misses       7428     7428           
  Partials     2111     2111           

Flag	Coverage Δ
keras	82.53% <85.10%> (ø)
keras-jax	63.33% <31.91%> (ø)
keras-numpy	58.53% <27.65%> (ø)
keras-openvino	33.79% <0.00%> (ø)
keras-tensorflow	63.74% <31.91%> (ø)
keras-torch	63.37% <31.91%> (ø)

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[mattdangerw]

Code looks good! Haven't tested out the progbar or anything like that.