[code-infra] Enable undefined addition to optional properties #3302
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Configured a new rule to error only in packages files (no docs or tests). It has autofix to add the
| undefinedtype to the relevant optional types. Currently, it checks for all the optional types and there is not filtering (ie, only properties of exported types, etc). The main change is in the first commit. 2nd commit is the autofix.Fixes - #1916
PR for the eslint rule - mui/mui-public#909