Fix S2259 FP: `PropertyReference` does not learn from underlying symbol

[Tim-Pohlmann]

public string Value { get; private set; }
private void Foo()
{
    string value = null;
    if (Value != null)                      // Branching on Value
    {
        value = "";
    }

    if (Value != null)                      // Both branches enter here because PropertyReference is not learning from TrackedSymbol
    {
        Console.WriteLine(value.Length);    // Noncompliant FP
    }
}

How to fix:
PropertyReference processor needs similar logic to FieldReference processor.