[TASK] Better performance for LiveSearch

We removed the SQL query on pages (column: pid) for TYPO3
administrators, because this group of people has access to
all pages anyway. Especially in large TYPO3 instances
the collection of all pages UIDs took a lot of time.

Resolves: #96356
Releases: main, 11.5
Change-Id: I436e15e79ce590c4228b9a9034f83497fa1db92e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72661


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>