Add PagesDomain to GraphQL

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What does this MR do and why?

• This MR is related to issue #469055 and links to MR !185197 (closed).

• moved pages_domain and certificates_source_enum.rb to app/graphql/types/pages

• generate the update documentation and schema definition using the command bundle exec rake gitlab:graphql:compile_docs

• revert accidental changes to policy_deployment.rb (I accidentally touched the deployment_policy.rb file, thinking it was my work file sorry for my mistake) the sha commit is 2abb7cf0

• create a policy for pages_domain

• Move MR !185197 (closed) to Community fork to run specs in CI, as suggested by @justin_ho.

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