[TASK] Ensure auto-created redirect are stored on site root

Long time back auto-created redirects were created on
page "0", which has been changed meanwhile to create them
using the pageId of the changed page as `pid`.

With this change, auto-created redirects now use the
siteConfigs rootPageId as `pid`. This acts as a preparation
for following features and site based redirects editing
capabilities.

Resolves: #99044
Related: #91776
Releases: main
Change-Id: I9ebacd268999d6a5bdf765dc14ebac5f11777514
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76521


Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Benni Mack <benni@typo3.org>