[TASK] Deprecate DataHandler->destPathFromUploadFolder()

The method in DataHandler->destPathFromUploadFolder is basically
useless nowadays and should be avoided, since it just prepends PATH_site
to a string.

The fourth parameter for extFileFunctions() is also useless as the method
only is triggered for "deleteAll" and no other value is allowed.

Resolves: #80513
Releases: master
Change-Id: I371fd9233bbe63dd2d3775e4ddd8212358164ced
Reviewed-on: https://review.typo3.org/52211


Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>