[TASK] Remove change 'encryption key' and 'site name' from Install Tool

Important actions 'Change site name' is available in 'All configuration'
and has only been there for historical reasons.

'Change encryption key' can commit hazard to a system and shouldn't
be there as a casual button for non experienced users.

Resolves: #80553
Releases: master
Change-Id: I4751c394263d6d8185567b811816a14cdd82a515
Reviewed-on: https://review.typo3.org/52245


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>