[FEATURE] Add scheduler information to system information toolbar

[FEATURE] Add scheduler information to system information toolbar

The system information toolbar now shows useful information
about the (automatic) execution/configuration of the TYPO3
scheduler if the system extension is activated and if there
are any tasks configured at all.

- Show a warning when the scheduler execution seems not
  to be configured correctly
- Show start date, start time, duration and execution type
  of the last sucessfully executed scheduler run
  - Highlight information if it was started manually

Releases: master
Resolves: #85569
Change-Id: Ic1b8a1c52678b60d40edcb77296f51f58ec01a4b
Reviewed-on: https://review.typo3.org/57609
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>
Reviewed-by: Stefanos Karasavvidis <sk@karasavvidis.gr>
Tested-by: Stefanos Karasavvidis <sk@karasavvidis.gr>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>