[TASK] Remove context service from install tool

This service was not useful anymore as the install tool modules handling
changed.

It is replaced by a single string that allows doing basically the same
job.

Resolves: #82353
Releases: master
Change-Id: I34e28e0d1a716b293897f54f7f800e5e6fb8e0c5
Reviewed-on: https://review.typo3.org/53966


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Matthias Vogel <typo3@kanti.de>
Tested-by: Matthias Vogel <typo3@kanti.de>
Reviewed-by: Simon Praetorius <simon@praetorius.me>
Tested-by: Simon Praetorius <simon@praetorius.me>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>