Consolidate validation in app entry points

[david-allison]

Most of the AnkiDroidApp validation only works if DeckPicker is the first activity

• Define the list of alternate entry points
  • ManageSpaceActivity; IntentHandler[2] etc...
  • fix: entrypoint standardization testing & use IntentHandler for CardBrowser deep links #21206
• Consolidate the entry points if possible
  • fix: entrypoint standardization testing & use IntentHandler for CardBrowser deep links #21206
• Ensure that fatal/startup errors are handled correctly

[mikehardy]

You are threatening to centralize app startup and move basic initialization and error handling to a central location? Hell Temperature Current Status: dropping

[github-actions]

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