[TASK] Allow DI for extbase validators

With #92238, it has been postulated that Extbase
validators should not be dependency injection aware.
Further places following this idea have been done
in v11 with #94451 and #94384. A final breaking
ReST file has been added with #95026.

All of that is pretty unfortunate and there is
simply no reason that Extbase validators can
not get dependencies injected, no matter if
they're not singletons.

This patch specifically targets v11 to allow
dependency injection in Extbase validators again
if extension authors really need this, and don't
want to stick to manual dependency retrieval
as outlined in #95026. This patch should basically
mitigate issues for extension upgrades and paves
the way for a more solid general solution in v12.

Extension authors have a more smooth upgrade path,
especially when supporting two core versions at
the same time.

The v12 version of this patch is identical with
v11 for now - The breaking interface change,
adapting all core validators, and ...