Make warmup_min_lr configurable in DeepSpeed integration
Author: tanuj-rai
Pull request: yes

# What does this PR do?

This PR makes the `warmup_min_lr` parameter in the DeepSpeed scheduler configurable. Previously, it was hardcoded to 0, limiting flexibility. This update allows users to specify `warmup_min_lr` in their DeepSpeed configuration.


Fixes #35428 


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Comments:
cc @muellerzr @SunMarc 

Thank you @SunMarc for the clarification!

I understand now that the hardcoded warmup_min_lr = 0 serves as a fallback default for when warmup_min_lr = "auto" is specified in the ds_config. Since users can already customize warmup_min_lr in their configuration, this behavior makes sense.
can you help me further what should I do with this issue.

Maybe there is no issue in the first place. Does explanation answer your question @SeunghyunSEO ? 

Thank you @SunMarc for reviewing it. 

I'm closing this PR for now !