This commit fixes the algorithm used to analyze a generic parameter. If
a type in the generic signature is protected, the type is return rather
than the full signature. This makes sure that the appropriate package
is used. Previously, it would have incorrectly used the type of the
raw class.
Using a generic type for such a use case is wrong, and ProtectedElement
has been updated to expose a `Class` rather than a `ResolvableType`.
See gh-28030
e873715737