Remove the tricium configs from recipes repo.

This files needs to be in the flutter/infra repository instead.

Change-Id: I71c75e5a3403405831216e888b675c7a306d359a
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/6360
Reviewed-by: Keyong Han <keyonghan@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>