[TASK] Move signals to own emit functions

Two new signals were introduced with the patch
https://review.typo3.org/#/c/27746/. This patch moves the dispatch of
the signals into own functions to improve the tracing of signals.

Resolves: #60133
Releases: 6.3, 6.2
Change-Id: Iecb7ff25ec31556c939dff6b0cf8749ebd3ff997
Reviewed-on: https://review.typo3.org/31452
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters