[1] Refactor AI response retrieval and creation

[MrOrz]

Refactors

• Extract AI response creation & retrieval logic from CreateAIReply

  • This will be reused in ListArticles, as it looks up transcripts and potentially creates one as AI replies.
  • createAIResponse creates an AI response in loading state and returns a callback . When transcript is done, calls the provided callback to update the AI response.
  • getAIResponse will try waiting for a loading AI Response if one exists.

• refactor(graphql): extract latest AI response retrieval logic to utility

• refactor(CreateAIReply): extract AI Response creation and updating to util function

[coveralls]

coverage: 88.175% (+0.03%) from 88.141% when pulling 1501d53f31b1dbef390db481c93b8f2d26eaff74 on refactor-ai-resp into aa5e85f7a62bf8562d8aa92b39b9b6d3f1487871 on master.