When a backend user with admin privileges switches to another user, the
entered user is now stored in the uc. The users stored in this list will
be rendered into the user menu to allow quick switching to the recent
users.

Resolves: #80581
Releases: master
Change-Id: I1a2128828d994f9de221d1615ded10683f4ce790
Reviewed-on: https://review.typo3.org/52225


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Henrik Elsner <helsner@dfau.de>
Tested-by: Henrik Elsner <helsner@dfau.de>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>