Cherry pick `Alit/mamba ux cicd (#10370)`
hey @JRD971000,  this PR got a bit delayed. Shall we still cherry-pick it? Can you help resolving the conflict? Otherwise feel free to close it @ko3n1g thanks for the reminder, I actually added the CIs in another PR. I don't know why I had two PRs for this :) 

However, I have a PR for removing optional flag from SSM test, given the rm -rf issue is hopefully gone:
https://github.com/NVIDIA/NeMo/pull/10460 closing this one
* add mamba init

* more ssm

* add 370m

* add hybrid

* fix issue

* integrate model and tokenizer config for ssm

* add all mamba configs

* modify state re pattern

* revert gpt stuff

* remove SSM class and training script

* Apply isort and black reformatting



* remove faulty export

* add script to test

* Apply isort and black reformatting



* some recent fixes

* Apply isort and black reformatting



* test script tp/pp1

* Apply isort and black reformatting



* add cicd

* include MLM mamba dist ckpt commit

* add license head and address more comments

* Apply isort and black reformatting



* add guard

* remove guard from TransformerConfig

* update scripts

* Apply isort and black reformatting



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