[TASK] Deprecate internal_type=file and file_reference

TCA "type=group" with "internal_type=file" and "internal_type=file_reference"
are the last parts of content related file handling that circumvent FAL.

All usages in the core have been changed since TYPO3 v6 until TYPO3 v9.

To prepare and unlock further file system related works in v10, it is
important we finally get rid of these parts that low level handles
uploads/ and other legacy functionality.

The patch finds any usages via TcaMigration, notes them as
deprecated and adds a series of hints to core places that can be
removed in v10. Note there is probably some hidden handling
left in the core, this is partially hard to find. We may stumble
upon more details in v10, but will have the freedom to remove
them then.

Resolves: #86406
Releases: master
Change-Id: I94f2fa6364277497e85e513f1bfd34cc0acf1390
Reviewed-on: https://review.typo3.org/58414


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>