[!!!][TASK] Remove deprecated methods from BackendUtility

Removes most deprecated code from BackendUtility, except a method
that has bigger cross dependencies to other deprecated code.

Removed methods:
TYPO3\CMS\Backend\Utility\BackendUtility::deleteClause()
TYPO3\CMS\Backend\Utility\BackendUtility::getOriginalTranslationTable()
TYPO3\CMS\Backend\Utility\BackendUtility::getTCAtypes()
TYPO3\CMS\Backend\Utility\BackendUtility::storeHash()
TYPO3\CMS\Backend\Utility\BackendUtility::getHash()
TYPO3\CMS\Backend\Utility\BackendUtility::getListGroupNames()
TYPO3\CMS\Backend\Utility\BackendUtility::getModTSconfig()
TYPO3\CMS\Backend\Utility\BackendUtility::unsetMenuItems()
TYPO3\CMS\Backend\Utility\BackendUtility::getModuleUrl()
TYPO3\CMS\Backend\Utility\BackendUtility::getPidForModTSconfig()
TYPO3\CMS\Backend\Utility\BackendUtility::getDomainStartPage()
TYPO3\CMS\Backend\Utility\BackendUtility::shortcutExists()

Method signatures:
TYPO3\CMS\Backend\Utility\BackendUtility::getPagesTSconfig() - Second and third argument dropped

Other notes:
Overriding page TSconfig on user TSconfig level with the 'mod.' prefix
is dropped, used 'page.mod' instead.

Resolves: #87206
Releases: master
Change-Id: Ib4102bfc24a99a22891deb46d4b1bb227ffd3936
Reviewed-on: https://review.typo3.org/59203


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>