Checker: fix declaring type for abbreviated types extensions

[auduchinok]

Continuation of #18645. Fixes DeclaringEntity for members defined in an abbreviated type extension:

module Module

type d = System.Collections.Generic.IDictionary<int, int>

type d{caret} with
    member x.P = 1

Since these members are now being analyzed due to the added recovery, it gets to a state that was never explicitly supported and tested, and there are places that are not ready for it.

The problem I've encountered in the Rider plugin tests is P member above assumes it's defined in the actual IDicitionary type, not in Module.

[github-actions]

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