Simplify keep_in_fp32_modules logic (#36722)
* better regex everywhere
* fix
* Update test_modeling_instructblip.py
* BC with explanations this time otherwise it makes no sense at all
* Update test_modeling_instructblip.py
* style
* CIs
* update _keep_in_fp32_modules in blip2
* Update modeling_utils.py
* Update modeling_utils.py
* style
* CIs
* add check
* trigger CIs
* Update modeling_utils.py
* trigger CIs
