[!!!][TASK] Remove unused updateRootlineData method

The method TemplateService->updateRootlineData() can
be removed. Until TYPO3 v11 TemplateService resolved
the TypoScript for a specific page, then found out the
actual used language (config.sys_language_uid via
TSFE->settingLanguage()) and then fetched the (translated)
rootline based on the resolved language information.

This is not needed anymore, as settingLanguage() does not
call this method anymore, and is called much earlier now,
see https://review.typo3.org/c/Packages/TYPO3.CMS/+/65044.

TypoScript is now always loaded after a translated
page rootline has been fetched.

This method is now completely unneeded, and is remoevd
without replacement as the concept has now been
streamlined.

Resolves: #96351
Related: #23736
Releases: main
Change-Id: If959a36333fcf5c91bee84ee497fddd2bfcec89b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72605


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Benni Mack <benni@typo3.org>