[core] Use `Array.includes` instead of index checking

[DiegoAndai]

Follow up of #42283 (comment)

Dropping IE 11 support (#14420) allows us to replace Array.indexOf('some string') [===|!==] -1 as a substitute for Array.includes. This issue is to track this refactor.

#42283 (comment) for a list of the Material UI-specific ones.

Search keywords: array includes