[BUGFIX] Avoid trigger_error for "rootUid" related methods

In #95037 the "rootUid" option has been deprecated
in favour of "startingPoints", which now allows to add
multiple root nodes for a tree.

However, for backwards compatibility, the "rootUid"
option is still used in core. The corresponding setter
and getter methods should therefore not trigger a
deprecation log entry. Extension scanner still finds
usages in extension code as weak match.

Resolves: #95163
Related: #95037
Releases: master
Change-Id: I6a974861949dfc2163a93e2e4fc60f27caafc7c2
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70982


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>