[Binding SG] Add warning when referencing results of other source generators #23646
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Description of Change
Source generators operate independently by design, meaning they cannot utilize each other's outputs. In the case of the Binding Source Generator (SG), this implies that it cannot use the results of XamlG. This change adds a warning when lambda parameters or the lambda body contain elements that cannot be resolved during source generation.
Issues Fixed
Fixes #23531