[TASK] Detect page routes based on deleted+workspace restriction

The Page Router checks for all pages that are available by using
the FrontendRestrictionContainer for database queries.

This leads to side-effects in the future.

Instead, - because all page slugs in one site are unique per
language+workspace - the Page Router should only check
for deleted+current workspace, not wondering about any other
restriction, as this is done when all pages in the rootline are
checked later-on anyway.

This way, frontend previews should be available again.

Resolves: #86037
Releases: master
Change-Id: Ic11a66a958f9391de9084fad86b5d59109bd21c3
Reviewed-on: https://review.typo3.org/58084


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Daniel Sattler <sattler@b13.de>
Tested-by: Daniel Sattler <sattler@b13.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>