Remove the formatting-check ci build until we decide what we should do with it

If we ignore it, it’s just noise.

We need to decide:
- fix the code to be like yapf wants to be (I’m against this)
- change the rules, to make them way more flexible, and then apply them
- don’t run yapf at all

.gitlab-ci.yml

@@ -86,12 +86,3 @@ pylint-plugins:
     - pip3 install -r requirements-plugins.txt
     - python3 setup.py install
     - pylint -E plugins
-
-formatting-check:
-  stage: test
-  image: python:3
-  allow_failure: true
-  script:
-    - pip3 install yapf
-    - yapf -dpr poezio
-    - "[ -n \"$(yapf -dpr poezio)\" ] && echo 'Formatting check failed, please run yapf' && exit 1 || echo 'Formatting check succeeded'"