[TASK] Add tests for log `#[Channel(...)]` attribute

v11 introduced support for using a Channel attribute to define
what log channel should be injected into a class, either via
the constructor or the LoggingAwareInterface. However, the
initial patch lacked any tests.

This patch adds basic tests to verify that the attribute works,
and indirectly document it.

Resolves: #97695
Related: #95079
Related: #95044
Releases: main, 11.5
Change-Id: I7cc97fc839ccd4015ac20b1bce787d4cbbc40a26
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74750


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>