[BUGFIX] Allow all child nodes in ActionMenuItemGroupViewHelper

While it was with good intentions, restricting the allowed child nodes
of the view helper restricts developers / integrators too much in their
usage as valid cases of using loops or conditions do not work anymore.
These restrictions have been removed.

Resolves: #87179
Releases: master, 9.5
Change-Id: I36c87a69902eb84bbe551f79d959f1869673e459
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63927


Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>