[BUGFIX] Convert class aliases of switchable controller actions to FQCN's

When the patch https://forge.typo3.org/issues/87550 changed the controller
configuration of plugins and modules to use fully qualified controller
class names instead of just controller aliases, the override mechanism
called switchable controller actions, that can be used via typoscript
and flexforms broke.

This is due to the fact that switchable controller actions are usually
still used with controller aliases rather than fully qualified controller
class names.

To fix this, method overrideSwitchableControllerActions of class
\TYPO3\CMS\Extbase\Configuration\AbstractConfigurationManager has been
adjusted to convert controller aliases to FQCN's before overriding the
controller configuration.

Releases: master
Resolves: #88513
Relates: #87550
Change-Id: Ie2d1eb4b64d03d4e17d08a85aa7f8e548bff92bb
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60906


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>