[BUGFIX] InvalidArgumentException in ActionControllerTest

The cache identifier causing the exception looks like this:
randomviewobjectpattern_@package_mycontroller_myaction_myformat

However, "@package" should be "@extension" in that regard and
besides that, the cache identifier using the vendor names shall
be used in the tests.

Resolves: #56822
Releases: 6.2
Change-Id: Ic78a8690559486efcbc7f5da7219a445f3f6707f
Reviewed-on: https://review.typo3.org/28300
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Markus Klein
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader