[TASK] Remove @internal on new UpgradeWizard interfaces

To allow others to use the new upgrade wizard API the
interfaces are no longer marked as @internal.

Resolves: #86448
Releases: master
Change-Id: I2e146e6d27c5aaed922a004054b3df2bbea88cb8
Reviewed-on: https://review.typo3.org/58466


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>