Add tests to check Content API status response
user
```ruby
require_relative "../integration_test_helper"

class ContentApiResponseTest < ActionDispatch::IntegrationTest
  def status_for_url(url, status)
    url = "/#{url}" if url[0] != "/"
    response = {
      status: status,
      body: "{\"test\":\"bleh\"}"
    }
    stub_request(:get, "https://contentapi.test.alphagov.co.uk#{url}.json").to_return(response)
  end

  should "render the page with a 500 error code when receiving a 500 status" do
    status_for_url "/my-item", 500
    visit "/my-item"
    assert_equal 503, page.status_code
  end

  should "render the page with a 500 error code when receiving a 501 status" do
    status_for_url "/my-item", 501
    visit "/my-item"
    assert_equal 503, page.status_code
  end

  should "render the page with a 500 error code when receiving a 502 status" do
    status_for_url "/my-item", 502
    visit "/my-item"
    assert_equal 503, page.status_code
  end

  should "render the page with a 500 error code when receiving a 503 status" do
    status_for_url "/my-item", 503
    visit "/my-item"
    assert_equal 503, page.status_code
  end

  should "render the page with a 500 error code when receiving a 504 status" do
    status_for_url "/my-item", 504
    visit "/my-item"
    assert_equal 503, page.status_code
  end
end
```
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