[TASK] Simplify TemplateView inheritance chain

The fluid view classes have a rather complex inheritance
and dependency chain, especially when looking at the
various extbase related classes, too.

One step is TYPO3Fluid\Fluid\View\TemplateView: This empty
class adds no value, TYPO3\CMS\Fluid\View\AbstractTemplateView
can extend TYPO3Fluid\Fluid\View\AbstractTemplateView instead,
without functional change.

Resolves: #94973
Releases: master
Change-Id: I41888b371d69ca70deb30ff0d47028d4c8e0e6ff
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70734


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>