Blogging Prompts: connect functionality and UI

[ScoutHarris]

Items that need addressing when Blogging Prompts endpoints are available.

• [x] Scheduling view: hook up Include prompt toggle. (Ref: #18316)
• [x] Blogging Prompts Settings (Ref: #18549)
  • [x] Prepopulate the reminder schedule if a remote schedule exists. (ref: p1652112794189519-slack-C0339PBMQ92) #18753
• [x] Compact Prompt Card: (Ref: #18402)
  • [x] Check for cached prompt before fetching. (#18658)
  • [x] Update answered state (#18572)
  • [x] Show new post when Answer tapped. (#18599)
  • [x] ~~Show share sheet when Share tapped.~~ Remove for V1. (#18670)
  • [x] Hide for self-hosted sites (#18819)
  • [x] Add a help button similar to the one on the blogging reminders settings screen
• [x] Prompt Card: (Ref: #18250)
  • [x] Show/hide depending on is_potential_blogging_site field ("we can use the prompts_card_opted_in setting that in the backend is currently (diff under review) equals the is_potential_blogging_site field judged on the backend")
  • [x] Check for cached prompt before fetching. (#18642)
  • [x] Update train of avatars (#18534)
  • [x] Update number of answers (#18534)
  • [x] Update answered state (#18534)
  • [x] Show new post when Answer tapped. (#18599)
  • [x] ~~Show share sheet when Share tapped.~~ Remove for V1. (#18670)
  • [x] Overflow menu:
    • [x] View more prompts: show prompts list (#18505)
    • [x] Skip this prompt: remove the current card from the dashboard. (#18642)
    • [x] ~~Remove from dashboard: permanently remove prompt cards from dashboard.~~ The menu item is removed for V1. (#18627)
  • [x] Update display logic to (prompts_reminders_opted_in || (!prompts_reminders_opted_in && is_potential_blogging_site) (#18816)
• [x] Feature Introduction:
  • [x] Ensure that the feature introduction modal doesn't clash with other modals shown during app launch, e.g. feature announcement, new Stats. Refs p1654007734556469-slack-C0339PBMQ92 (#18820)
  • [x] Remove showing feature introduction on app launch. (#18820)
    • [x] WordPressAppDelegate - WPTabBarController.sharedInstance().showBloggingPromptsFeatureIntroduction()
    • [x] WPTabBarController - showBloggingPromptsFeatureIntroduction()
  • [x] Try it now: populate post content with prompt content. (#18597)
  • [x] Filter out self-hosted sites when tapping on 'Try it now' (#18829)
• [x] Post creation (Ref: #18473)
  • [x] When creating an answer prompt post, pass the prompt's metadata with it. (See #18717, #18808) (ref: D80516-code) "metadata": [ { "key": "_jetpack_blogging_prompt_key", "value": 235, "operation": "update" } ]
  • [x] Add a dailyprompt tag to posts which answer the prompt (#18851)
• [x] Prompts List: check for cached prompt before fetching. (#18658)
  • [x] Fetch today's prompt where appropriate (#18842)
• [x] #18761