refactor(devtools): disable cypress and remove dependencies

Previously we were running Cypress in CI. Since cypress needs to be installed to run these tests, it was decided that we would not run devtools' cypress tests until a decision could be made on an e2e testing solution.

This commit removes all package scripts, dependencies, and CI commands that reference cypress. Notably it leaves the actual tests in the devtools directory intact, so that they can be referenced later once a decision is made.

.circleci/config.yml

@@ -277,7 +277,6 @@ jobs:
           paths:
             - ./ng
             - ./bazel_repository_cache
-            - .cache/Cypress
 
   lint:
     executor: default-executor
@@ -745,9 +744,6 @@ jobs:
       - run:
           name: Test production build
           command: yarn devtools:build:chrome
-      - run:
-          name: Run e2e tests
-          command: yarn devtools:e2e
 
 workflows:
   version: 2