[TASK] Hide page alias in pagetree overview with sites

If rendering page trees in Info -> Pagetree overview that has
a full Site configuration, hide the "alias" field - it is not
shown in FormEngine, either.
If rendering a PseudoSite (no site configuration), hide the
slug field.

Resolves: #86175
Releases: master
Change-Id: I46ccb150184e4b76799ab8636ac280eda269c76b
Reviewed-on: https://review.typo3.org/58204


Tested-by: TYPO3com <no-reply@typo3.com>
Tested-by: Joerg Kummer <typo3@enobe.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: rolandgolla <rolandgolla@gmail.com>
Tested-by: rolandgolla <rolandgolla@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>