ci: fix parallelism for e2e node 8.x job (#12341)

Author: clydin

.circleci/config.yml

@@ -98,11 +98,11 @@ jobs:
     environment:
       BASH_ENV: ~/.profile
     resource_class: xlarge
-    parallelism: 4
+    parallelism: 2
     steps:
       - attach_workspace: *attach_options
       - run: npm install --global npm@6
-      - run: xvfb-run -a node ./tests/legacy-cli/run_e2e --glob=tests/basic/*
+      - run: xvfb-run -a node ./tests/legacy-cli/run_e2e --glob=tests/basic/* --nb-shards=${CIRCLE_NODE_TOTAL} --shard=${CIRCLE_NODE_INDEX}
 
   e2e-cli-ng-snapshots:
     <<: *defaults
@@ -112,7 +112,6 @@ jobs:
     parallelism: 4
     steps:
       - attach_workspace: *attach_options
-      - run: npm install --global npm@6
       - run: xvfb-run -a node ./tests/legacy-cli/run_e2e --nb-shards=${CIRCLE_NODE_TOTAL} --shard=${CIRCLE_NODE_INDEX} --ng-snapshots
 
   build: