[TASK] Mark EXT:rsaauth as deprecated

Only https can really secure a connection. Therefore rsaauth
should be marked as deprecated. An additional report checks the
usage of the extension and https.

Resolves: #81852
Releases: master
Change-Id: I5d12e1e7c97d55869379228b39fa5e87b2287e88
Reviewed-on: https://review.typo3.org/53458


Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>