[FR] compose - depends_on string format support

[JohnPreston]

In recent compose changes, there is now more details about the depends_on conditions.

    depends_on:
      broker:
        condition: service_started

The valid list is

• service_started
• service_healthy
• service_completed_successfully

Which aligns very well with the existing deploy.labels ecs.depends.condition

If the user sets either, import. If the user sets both, use the deploy.labels value as this is clearly the expected behaviour for compose-x to follow.