[TASK] Remove unused ContainerViewHelper from ext:install

The ViewHelper is not in use anymore and can be removed.

Resolves: #77285
Releases: master
Change-Id: I780e01dda278d258f693ee3663bcee4ba406f4e5
Reviewed-on: https://review.typo3.org/49238


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>