[TASK] Introduce unique signal registration

Signals should be dispatch in own emit functions for better locating.
This patch moves signals to separate functions and attaches missing
suffixes to existing ones.

Resolves: #59774
Releases: 6.3, 6.2
Change-Id: I7a1411566a78e326f1f870b2d345631e7ca265e0
Reviewed-on: https://review.typo3.org/31013
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring