Use correct path for NewtonsoftJson ModelState errors

[halter73]

Use correct path for NewtonsoftJson ModelState errors

The NewtonsoftJsonInputFormatter has logic that's intended to append the names of missing required properties to the ModelStateDictionary key. Normally, just the ModelName and ErrorContext.Path is used for this key, but ErrorContext.Path does not include the missing required property name like we want it to. For example, given the following class and input missing the required "Name" property:

class Person
{
    [JsonProperty(Required = Required.Always)]
    public string Name { get; set; }
}

We will see the following ErrorContext:

Error   {"Required property 'Name' not found in JSON. Path 'Person'..."} System.Exception {Newtonsoft.Json.JsonSerializationException}
Member  "Name"   object {string}
Path    "Person" string

So the path used for the ModelStateDictionary key is updated to be "Person.Name" instead of just "Person".
See aspnet/Mvc#8509

However, this logic is caused problems with different JSON deserilization errors that include the member in the path but not at the end. For example, given the following classes and invalid input like { "b": { "c": { "d": abc } } }:

class A
{
    public B B { get; set; }
}
class B 
{
    public C C { get; set; }
}
class C 
{
    public string D { get; set; }
}

We will see the following ErrorContext:

Error   {"Unexpected character encountered while parsing value: b. Path 'b.c.d'..."} System.Exception {Newtonsoft.Json.JsonReaderException}
Member  "c"     object {string}
Path    "b.c.d" string

Notice that Member "c" is in the middle of the Path "b.c.d". The error handler gets invoked for each level of nesting. null, "b", "c" and "d" are each a Member in different ErrorContexts all reporting the same parsing error.

The parsing error is reported as a JsonReaderException instead of as a JsonSerializationException like for missing required properties. We use the exception type to filter out these errors and keep the path used for the ModelStateDictionary key as "b.c.d" instead of "b.c.d.c" like before.

Fixes #33451

[halter73]

I created a new issue for the single quote escaping and linked to it from the skipped test. I hoping to get this approved today since I'm OOF starting tomorrow.

[pranavkm]

Thanks for the very detailed PR description!