Vcref finding rnode

[pkozlowski-opensource]

Only the second commit to be reviewed (the first one is part of #23164)

As we no longer create native (RNode) comment nodes for containers,
we need to execute logic for finding a next sibiling node with RNode
when inserting a view.

The mentioned logic need to be updated for the case of dynamically
created containers (LContainerNode). Indeed, we need to be able to
descend into dynamically inserted views while looking for a RNode.
To achieve this we need to have a pointer from a host LNode to a
dynamically created LContainerNode).

[marclaval]

LGTM.

If #23189 goes in, then you might want to merge the tests in the new structure.

[IgorMinar]

g3 presubmiting missing

[vicb]

blocked: needs to be rebased on the first PR

[mhevery]

http://test/OCL:191759791:BASE:191759822:1522948909934:ead132ed ✅

[mary-poppins]

You can preview 36eb8d7 at https://pr23193-36eb8d7.ngbuilds.io/.

[mary-poppins]

You can preview bde3769 at https://pr23193-bde3769.ngbuilds.io/.

[vicb]

http://test/OCL:191790784:BASE:191790873:1522960875298:584ad310

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