[TASK] Remove install tool update wizards related to TYPO3 CMS 7

As the upgrade procedure states that people upgrading
to TYPO3 v8, need to run through existing LTS
installations, all installations need to go to 7 LTS first
and run the upgrade wizard.

For v8 all existing upgrade wizards can be removed.

Releases: master
Resolves: #72367
Change-Id: Ic2b827c7bbcb7dea444c4c125ecc5f8a057e76ea
Reviewed-on: https://review.typo3.org/45394


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>