[BUGFIX] Correct tooltips for pages in the page tree

Make tooltips for pages in the page tree correct (in case of shortcuts,
and mountpoints).

* add missing fields to selection in page tree Repository
required by BackendUtility->titleAttribForPages()
* add guard clauses for page 0 to avoid unnecessary processing
* fixes several notices

Resolves: #86631
Releases: master
Change-Id: Ia0229203b78ef8c58e066ef3a587c1de1ee0b975
Reviewed-on: https://review.typo3.org/58616


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>