[CLEANUP] Remove unnecessary @todo annotations

Removes "Define visibility" @todo annotations in
phpdoc blocks of public variables and methods which
are used in index_ts.php and have therefore be public.

Resolves: #57865
Releases: 6.2
Change-Id: Ide7190fcabb802bf5f4706c916f2e3ac0ee53be7
Reviewed-on: https://review.typo3.org/29434
Reviewed-by: Oliver Klee
Reviewed-by: Stefan Neufeind
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn