[TASK] Move FE user intialization into constructor

Certain options are set from outside as public property,
however these options are always set and can be set from within
FrontendUserAuthentication itself.

This way, more "logic" is moved from TSFE into the appropriate
objects themselves.

Resolves: #78827
Releases: master
Change-Id: Iba0d0ff805a885895fafb09b8852679f9870dbe9
Reviewed-on: https://review.typo3.org/50799


Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
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: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>