[BUGFIX] Resolve correct page in slug validation

The SlugHelper now receives an encapsulated RecordState object that
represents a record.

This allows fine-grained control over a record and helps resolving
related information, which is required to resolve slugs properly in a
case where e.g. the node ("parent") and language uid can occur multiple
times.

The RecordState contains:

- an EntityContext which describes a variant of a record by its language
  and workspace assignment

- a node object (EntityPointer) that points to the node (aka "parent") of
  the record

- a EntityUidPointer that describes the origin of the record by its table
  name and uid

The RecordStateFactory creates such RecordState objects and enriches them
with links (EntityPointerLink) that point to languages and versions, that
are also represented by EntityPointer implementations.

Resolves: #86195
Releases: master
Change-Id: If17a30e98f802825d80e95044572153f2426bea2
Reviewed-on: https://review.typo3.org/58229


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Wolf <andreas.wolf@typo3.org>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>