[!!!][TASK] Remove deprecated functionality in BackendUtility

The following previously deprecate static methods
are now removed:

- TYPO3\CMS\Backend\Utility\BackendUtility::getRawPagesTSconfig()
- TYPO3\CMS\Backend\Utility\BackendUtility::editOnClick()
- TYPO3\CMS\Backend\Utility\BackendUtility::getViewDomain()
- TYPO3\CMS\Backend\Utility\BackendUtility::getBackendScript()
- TYPO3\CMS\Backend\Utility\BackendUtility::TYPO3_copyRightNotice()

Resolves: #91481
Releases: master
Change-Id: I8943f2e14ce1dbcb1195fffef5afe329b5f3ab79
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64585


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>