Fix diagnostics for namespaces with internal partial types #1426
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The diagnostics analyzer for namespaces found all the namespaces which had public types and then made sure they are a subset of the one which the authored component is. As part of determining public types, the check also considered partial types to be public with the assumption that it would later to be checked to figure out whether it is really public or not. But for the namespace diagnostics this wasn't done as it is done in other scenarios. In addition, partial types don't matter for namespace diagnostics as the diagnostics analyzer will see at least one of the partial types with its declared accessibility. Due to that, this PR addresses this issue by making the namespace check only look for public types and not partial ones.
Fixes #1425