[Container Registry] Validate delete 404s

[seankane-msft]

On delete operations that return a status code of 404, we should validate the body of the response contains the appropriate response of NAME_UNKNOWN for delete_repository, TAG_UNKNOWN for delete_tag, and MANIFEST_UNKNOWN for delete_manifest` operations

[seankane-msft]

for a callback, something like:

def handle_delete(expected_error, pipeline_response, deserialized, headers):
    if pipeline_response.http_response.status_code == 404:
        if expected_error in pipeline_response.http_response.text:
            return
        raise ResourceNotFoundError(...)

Then when you use it:

cls = functools.partial(handle_delete, MANIFEST_UNKNOWN)