[pickers] Remove `TDate` generics in favor of `PickerValidDate` direct usage

[flaviendelangle]

Closes #14796

Side note: all PickerValidDate | null passed as a generic will be replaced with a true or false once TValue is replaced by TIsRange (phrase 2 of #14823).

I will do the migration guide after the phase 2 of #14823 to have a finalized list of the breaking changes on the generics.

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Deploy preview: https://deploy-preview-15001--material-ui-x.netlify.app/

Updated pages:

• docs/data/common-concepts/custom-components/custom-components.md
• docs/data/date-pickers/custom-field/custom-field.md

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[flaviendelangle]

Have you tried exploring a solution of localized PickerValidDate redefining? 🤔

How would you do that?

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[flaviendelangle]

@LukasTy one option would be to add the following code in one of the doc files:

declare module '@mui/x-date-pickers/models' {
  interface PickerValidDateLookup {
    fakeDocAdapter: any;
  }
}

It would not impact Codesandbox / Stackblitz. We would have any as a value in the doc examples but I don't think we care since today we have the union of all the date library types and we never really missed this type safety.

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