[!!!][BUGFIX] Reorder processing of TCA select items

It's now possible again to add and remove items via
pageTSconfig after itemsProcFunc has been processed
for TCA select fields.

Resolves: #75834
Releases: master
Change-Id: I6535f73c951a03abf3548c84877a08c4ea1ee2fa
Reviewed-on: https://review.typo3.org/55513


Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Reiner Teubner <rteubner@me.com>
Reviewed-by: Tobi Kretschmann <tobi@tobishome.de>
Tested-by: Tobi Kretschmann <tobi@tobishome.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>