[TASK] Add admin and editor actor for acceptance tests

An admin and an editor actor has been added for the
acceptance test suite. These actors are able to reuse
a session that is imported in the fixture.
Reusing the session does speed up the tests as to login
process must not be done on every test.

Change-Id: Ie20972c8b968ee8e986df0e0ee91460aa6dde68a
Resolves: #75550
Releases: master
Reviewed-on: https://review.typo3.org/47627


Reviewed-by: Dirk Jüttner <dirk.juettner@gmail.com>
Tested-by: Dirk Jüttner <dirk.juettner@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>