ExcludeFromCodeCoverage attribute on local functions ignores lambda expression

[daveMueller]

closes #1302

[daveMueller]

The issue is only for lambda methods inside local functions. The algorithm that checks if the function name is synthesized by the compiler doesn't work here because the base for the lambda method name is the 'parent' function and not the local function.

For example when we have the following code:

public void ParentFunction()
{
    [System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
    static Func<string, bool> LocalFunction()
    {
        return myString => myString.Length == 10;
     }
}

The name of the local function is sth like <ParentFunction>g__LocalFunction|0_0 and the name of the lambda method sth like <ParentFunction>b__0_1. The current algorithem compares only the name of the 'parent' function which is ParentFunction and looks up if it is already excluded.
Unfortunately ParentFunction isn't the one with the ExcludeFromCodeCoverage attribute and thus the lambda method isn't excluded.

I couldn't think of any other solution besides this PR because from a name like <ParentFunction>b__0_1 it seems impossible to figure out if the lambda method is inside a local function or not.

[MarcoRossignoli]

Let's resolve the conflict and we can merge thanks

[daveMueller]

Ok I resolved the merge conflicts.