Create GraphQL mutations for pages settings

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In order to move Pages Settings to vue we have to create a Graphql mutation for toggling the below two pages settings:

type Project {
  pagesForceHttps: Boolean
  pagesUseUniqueDomain: Boolean
}

Note: the mutations should return the updated project in order for Apollo to update the state in its cache, something like this:

mutation PagesForceHttps {
  setPagesForceHTTPS(input: { id: "<PROJECT_ID>", value: true }) {
    project {
      id
      pagesForceHttps
    }
    errors
  }
}

Implementation guide

The current implementation is part of the update method in app/controllers/projects/pages_controller.rb (the project_params in praticular).

For each mutation there should be a new file in app/graphql/mutations/pages that implements the mutation. There is already one mutation in that folder (mark_onboarding_complete.rb) that is a good implementation example.

The mutation classes then need to be added to app/graphql/types/mutation_type.rb to make them available.

Lastly, there should be a unit test for each mutation in spec/graphql/mutations/pages/, again the mark_onboarding_complete_spec.rb can be a good implementation example.