[TASK] Use composer name from request route

Since backend routes contain the package name
which defined a route, we can use this in backend
view related API and don't need to hand over the
composer name as argument anymore in most situations.

The patch thus simplifies the ModuleTemplateFactory
API and its usages, refactors BackendViewFactory,
and adds some functional tests to verify
BackendViewFactory template path override logic.

Resolves: #96962
Related: #96961
Related: #96730
Releases: main
Change-Id: I0787e21336f5a5f9b9a879555390dd5280a80024
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73598


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>