[Proposal]: Improve overload resolution for delegate compatibility

# Improve overload resolution for delegate compatibility

* Specification: https://github.com/dotnet/csharplang/discussions/8614
* Discussion: https://github.com/dotnet/csharplang/discussions/8614

## Summary
[summary]: #summary

Improve overload resolution when looking for applicable methods by removing methods that cannot be compatible. This will allow the following code to compile (it does not today):
```cs
public class Program1
{
delegate void MyAction(T x);

void Y(long x) { }

void D(MyAction o) { }
void D(MyAction o) { }

void T()
{
D(Y); // Ambiguous between both D calls, despite the fact that `void D(MyAction)` is not a valid target.
}
}
```

## Design meetings