Fix TQDMProgressBar reset and update to show correct time estimation

[rohitgr7]

What does this PR do?

Fixes #12875
Also fixes #12787

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cc @Borda @tchaton @rohitgr7 @awaelchli

[rohitgr7]

I am unsure how to test this since all I could do is observe the tqdm bar and check the it/s consistency across epochs.