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Set Cache-Control to no-cache (#1356)

- Adds a Nest interceptor which, when applied, sets the `Cache-Control` directive to `no-cache`. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#directives
- Adjusts the redirects on the `RelayLegacyController`:
  * With `res.redirect`, a response was being sent to the clients, and the interceptor would fail to set the header (resulting in a 500 – "Cannot set headers after they are sent to the client").
  * By returning an object with `{ url }` with the intended redirect in addition to the decorator `@Redirect`, the header is set correctly before the body is sent out to the clients. See https://docs.nestjs.com/controllers#redirection

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