[TASK] RTE MagicImage should use FAL processing API

The RTE magic still copies images to the old upload folder and
does not use the processed file functions of FAL.

This patch changes the RTE magic so storage 0 is not used any more
and that the FAL API is used for processing the images.

Resolves: #51807
Releases: 6.2
Change-Id: I07d609f9e638d79e785be4ebfd25631c70e3d141
Reviewed-on: https://review.typo3.org/23663
Reviewed-by: Stanislas Rolland
Tested-by: Stanislas Rolland