Remove shippable config. (#2440) (#2444)

(cherry picked from commit 1f41e66f09)

Co-authored-by: Felix Fontein <felix@fontein.de>

shippable.yml

@@ -1,48 +0,0 @@
-language: python
-
-env:
-  matrix:
-    - T=none
-
-matrix:
-  exclude:
-    - env: T=none
-  include:
-    - env: T=devel/sanity/1
-    - env: T=devel/sanity/2
-    - env: T=devel/sanity/3
-    - env: T=devel/sanity/4
-
-    - env: T=2.11/sanity/1
-    - env: T=2.11/sanity/2
-    - env: T=2.11/sanity/3
-    - env: T=2.11/sanity/4
-
-    - env: T=2.10/sanity/1
-    - env: T=2.10/sanity/2
-    - env: T=2.10/sanity/3
-    - env: T=2.10/sanity/4
-
-    - env: T=2.9/sanity/1
-    - env: T=2.9/sanity/2
-    - env: T=2.9/sanity/3
-    - env: T=2.9/sanity/4
-
-branches:
-  except:
-    - "*-patch-*"
-    - "revert-*-*"
-    - "patchback/backports/*"
-
-build:
-  ci:
-    - tests/utils/shippable/timing.sh tests/utils/shippable/shippable.sh $T
-
-integrations:
-  notifications:
-    - integrationName: email
-      type: email
-      on_success: never
-      on_failure: never
-      on_start: never
-      on_pull_request: never