Only suggest imports if not imported. #58381
                
     Merged
            
            
          
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Fixes #42944 and fixes #53430.
This commit modifies name resolution error reporting so that if a name
is in scope and has been imported then we do not suggest importing it.
This can occur when we add a label about constructors not being visible
due to private fields. In these cases, we know that the struct/variant
has been imported and we should silence any suggestions to import the
struct/variant.
r? @estebank