🚨🚨🚨 An attempt to fix #29554. Include 'LayerNorm.' in gamma/beta rename scope, optimize string search. (#35615)
* An attempt to fix #29554. Include 'LayerNorm.' in gamma/beta rename scope, reduce number of characters searched on every load considerably.
* Fix fix on load issue
* Fix gamma/beta warning test
* A style complaint
* Improve efficiency of weight norm key rename. Add better comments about weight norm and layer norm renaming.
* Habitual elif redunant with the return