[TASK] Add acceptance test for Template and Sites creation

Extends the existing site configuration acceptance test
by adding a default FE ts snipped and verifying FE is
rendered.

Resolves: #87191
Releases: master, 9.5
Change-Id: I369980f2de240db9647550dad73a2923a1aa6371
Reviewed-on: https://review.typo3.org/59184


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>