ci: remove Node.js v12 E2E job

Node.js v12 will become EOL on 2022-04-30. As a result, Angular as of v14 will no longer support Node.js v12.

Author: clydin

.circleci/config.yml

@@ -356,12 +356,6 @@ workflows:
               only:
                 - renovate/angular
                 - master
-      - e2e-cli:
-          name: e2e-cli-node-12
-          nodeversion: '12.20'
-          <<: *only_release_branches
-          requires:
-            - build
       - e2e-cli:
           name: e2e-cli-node-16
           nodeversion: '16.10'