[#72069960] Add in cache control switch in query responses
[#72069960] Add in cache control switch in query responses

- `fetch` Could possibly do with being refactored so that we use our cache_control class methods to serve the fetch response at all times, rather than playing around with the response headers in the method. Probably alright for the context of [this story](https://www.pivotaltracker.com/story/show/72069960) though

alphagov/backdrop,alphagov/backdrop,alphagov/backdrop