[BUGFIX] Extbase behaviour concerning workspaces

Issue #26732 introduced some behaviour into Extbase that cannot
work on the long-run. The usual behaviour of TYPO3 is "fetch
live, then overlay". Avoiding that chain might lead to
several side-effects.

This change integrates a new property "_versionedUid" than
contains the specific uid of the versioned record (this is
similar to the already existing _localizedUid property).
Besides that, changes of issue #26732 are reverted.

Functional frontend tests are enabled for live and workspace
for all IRRE ForeignField scenarios.

Resolves: #59107
Releases: 6.2, 6.3
Change-Id: Idc46fb86830bc3d750972adade178cf9c618ece5
Reviewed-on: http://review.typo3.org/32867
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>