[CPyCppyy] Correctly handle static method calls via derived instance #20496
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The mechanism to strip away the "self" argument from the call to a static method checks the type of "self", matching the exact type.
However, it should also remove the "self" if it is an instance of a derived type, because in C++ it is also possible to call static methods via instances of derived types.
A unit test was also added.
Closes #20463.