Primary ctor parameter writes should be assumed necessary even if not read later in the method

[RikkiGibson]

Version Used: VS 17.7.0 Preview 2.0

Steps to Reproduce:

class MyClass(int value)
{
    public int Get()
    {
        var x = value;
        value++; // IDE0059: unnecessary assignment of a value to 'value'
        return x;
    }
}

Expected Behavior: No diagnostic. Behavior should be similar to if a field 'int value' were explicitly declared in 'MyClass'.

Actual Behavior: IDE0059 is reported

Relates to #65697

[RikkiGibson]

Ping @arkalyanms @dotnet/roslyn-ide for triage

[arunchndr]

Starting with Cyrus for first look.

[mavasani]

Duplicate of #69643. Verified that this was fixed with #69748