Remove CircleCI nightly E2E tests (#9219)

These have been broken for a while

Author: Daniel15

.circleci/config.yml

@@ -49,13 +49,6 @@ test_build: &test_build
       fi;
       yarn build
 
-test_e2e_steps: &test_e2e_steps
-  steps:
-    - checkout
-    - run:
-        command: cd end_to_end_tests/data && ./run-ubuntu.sh
-
-
 test_run: &test_run
   run:
     name: Tests
@@ -211,22 +204,6 @@ jobs:
       - *attach_workspace
       - *test_build
       - *test_run
-  test-e2e-ubuntu1604:
-    <<: *docker_defaults
-    docker:
-      - image: ubuntu:16.04
-    <<: *test_e2e_steps
-  test-e2e-ubuntu1404:
-    <<: *docker_defaults
-    docker:
-      - image: ubuntu:14.04
-    <<: *test_e2e_steps
-
-  test-e2e-ubuntu1204:
-    <<: *docker_defaults
-    docker:
-      - image: ubuntu:12.04
-    <<: *test_e2e_steps
 
   publish:
     <<: *docker_defaults
@@ -250,19 +227,6 @@ notify:
 
 workflows:
   version: 2
-  nightly:
-    triggers:
-      - schedule:
-          cron: "0 0 * * *"
-          filters:
-            branches:
-              only:
-                - master
-    jobs:
-      - test-e2e-ubuntu1604
-      - test-e2e-ubuntu1404
-      - test-e2e-ubuntu1204
-
   install-test-build-and-publish:
     jobs:
       - install: