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

The following deprecated methods are now removed:

- \TYPO3\CMS\Core\Utility\GeneralUtility::compressIPv6
- \TYPO3\CMS\Core\Utility\GeneralUtility::flushDirectory
- \TYPO3\CMS\Core\Utility\GeneralUtility::getApplicationContext
- \TYPO3\CMS\Core\Utility\GeneralUtility::idnaEncode
- \TYPO3\CMS\Core\Utility\GeneralUtility::IPv6Hex2Bin
- \TYPO3\CMS\Core\Utility\GeneralUtility::IPv6Bin2Hex
- \TYPO3\CMS\Core\Utility\GeneralUtility::isRunningOnCgiServerApi
- \TYPO3\CMS\Core\Utility\GeneralUtility::linkThisUrl
- \TYPO3\CMS\Core\Utility\GeneralUtility::milliseconds
- \TYPO3\CMS\Core\Utility\GeneralUtility::presetApplicationContext
- \TYPO3\CMS\Core\Utility\GeneralUtility::resetApplicationContext
- \TYPO3\CMS\Core\Utility\GeneralUtility::verifyFilenameAgainstDenyPattern

In addition, makeInstanceService requires the third parameter to be array
instead of string or array.

The method "getUrl()" now only accepts one argument.

In addition, the testing framework is raised to 6.3.1 to not use
the unneeded methods anymore.

Resolves: #91513
Releases: master
Change-Id: I124b6f531fed61a93f5ed03391e1d4b6cf7a08ae
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64593


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>