Support no interaction mode

[akalipetis]

Currently, Platformify has only a single, interactive mode. We should support a --no-interaction mode, where the defaults should be picked for every question.

[chadwcarlson]

No interaction iff:

• --no-interaction flag passed in both Platform.sh and Upsun context
• PLATFORMSH_CLI_NO_INTERACTION=1 in the Platform.sh context
• UPSUN_CLI_NO_INTERACTION=1 in the Upsun context

Default attributes to set:

• Should pre-existing files be overwritten? (currently default false and exit)
• No runtime or stack detected
• Runtimes (when runtime, but not stack detected)
  • C#/.Net Core
  • Elixir
  • Go
  • Java
  • Lisp
  • JavaScript/Node.js
  • PHP
  • Python
  • Ruby
• Stacks (when stack detected)
  • Generic
  • Django
  • Express
  • Flask
  • Laravel
  • Next.js
  • Strapi