[!!!][TASK] Remove scheduler-related deprecated code

Resolves: #101040
Related: #100963
Related: #100247
Releases: main
Change-Id: Ifbdeb04f89e9f74cf07bb0c4f1e9b5511d0a0269
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79323


Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Thomas Hohn <tho@gyldendal.dk>