Handle Class.getMethods() returning multiple getters with just the return type differring

This can happen when getters are defined in an implement interface with a different return type (a supertype); in that case we get two getters for the same property in the array returned by `Class.getMethods()`.

Since the order of methods in that array is unspecified, in some cases it will work (super method then overridden method => we keep the overridden method), and in others it won't (overridden method then super method => we keep the super method).

Changing the loop to keep the most specific getter only fixes the problem.

I wasn't able to reproduce the problem in a unit test, but I know it happens with my JVM (OpenJDK 11) for `JaxbEmbeddable.getAttributes()`, and it caused `BytecodeRecorder` to fail, especially with the tests added by #16630 .

Fixes #16954