[BUGFIX] Respect uniqueInSite when moving records

When a page is moved from one site to another site
(two pagetrees with different sites), currently a duplicate
slug is possible. This should never happen, so the same
logic as for "uniqueInPid" is applied when moving records.

Resolves: #87884
Releases: master, 9.5
Change-Id: I9a2d5756958e09fa89fbbc384d03c0503b70bf8c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60534


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>