[TASK] Remove dummy files from ext:scheduler

Change-Id: Ic6a76ca3a2c78041a3357a5f0ec8ae5dcecca97b
Resolves: #47801
Related: #47756
Releases: 6.2
Reviewed-on: https://review.typo3.org/20396
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Felix Kopp
Tested-by: Felix Kopp
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn