[TASK] Initialise graphs in Dashboard Widgets based on graphConfig

No additional classes are needed anymore to initialise
the graphs in Dashboard Widgets. If a graphConfig is given
the chart will be initialised.

Resolves: #91100
Releases: master
Change-Id: Id25d272e4287a0248d982b600f792e5e32e76445
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64220


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Jonas Eberle <flightvision@googlemail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>