[BUGFIX] Stabilize page tree acceptance test

Resolves: #97931
Releases: main, 11.5
Change-Id: I745bffa0c6873f6b8ff5fb15f32da4cd6538959a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75170


Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>