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Bug: T403287
Currently we assert that a referenced component exists, however the referenced component can be a reference to another component.
We do not recursively resolve the references and to do that today would be somewhat complicated due to how the build info is looked up.
Expand the validation to assert that the "parent" component i.e. that
specified in SourceReference has a source type of SourceBuild.
Also add a test case for this.