C#: Don't return MethodInfo for overloaded methods

[raulsntos]

This means the GDScript analyzer loses the method signature information so it can't do type checking for the parameters.

• Fixes Impossible to call overloaded methods between languages #90946.
• Fixes GDScript Analyzer cannot correctly resolve C# arguments methods. #89924.

[paulloz]

It works fine 👌

Now, I'm not the one to judge whether the downside outweighs the benefits here, or not.

[akien-mga]

Thanks!