Set ProblemDetails status field during ObjectResult formatting

[khellang]

I just think it's convenient to have the status field present.

This allows you to do

var problem = new ValidationProblemDetails(ModelState);
return new UnprocessableEntityObjectResult(problem);

or

var problem = new ValidationProblemDetails(ModelState);
return new BadRequestObjectResult(problem);

And have the correct status code reflected in the problem details response.

One question is; should the result even override an existing status value?

The RFC states:

Generators MUST use the same status code in the actual HTTP response, to assure that generic HTTP software that does not understand this format still behaves correctly.

[pranavkm]

should the result even override an existing status value?

MVC generally avoids overwriting explicitly specified values with implicit \ inferred values. The current code seems fine as is.

[pranavkm]

Thanks for the PR!