Scaladoc: Implement "Run" logic in snippets

[pikinier20]

Recent changes to snippet prepare "Run" button in Scala snippets. We can discuss how and when should we allow user to run snippet (maybe via Scastie?)

[deusaquilus]

Hey @pikinier20. I don't see the "Run" button in the Dotty docs anymore. Was this feature removed recently?

[pikinier20]

Hey, it's not removed. We've just restricted the logic: Now the snippet can only be ran if it's checked by a snippet compiler. (It prevents non-sensical snippets from being ran)