Consolidated production requirements installation for discovery

The production-requirements target will now be responsible for installing npm/bower dependencies.

ECOM-6590

playbooks/roles/discovery/tasks/main.yml

@@ -96,23 +96,6 @@
     - devstack
     - devstack:install
 
-- name: install node dependencies
-  npm: executable={{ discovery_nodeenv_bin }}/npm path={{ discovery_code_dir }} production=yes
-  become_user: "{{ discovery_user }}"
-  environment: "{{ discovery_environment }}"
-  tags:
-    - install
-    - install:app-requirements
-
-- name: install bower dependencies
-  shell: ". {{ discovery_nodeenv_bin }}/activate && {{ discovery_node_bin }}/bower install --production --config.interactive=false"
-  args:
-    chdir: "{{ discovery_code_dir }}"
-  become_user: "{{ discovery_user }}"
-  tags:
-    - install
-    - install:app-requirements
-
 - name: migrate database
   command: make migrate
   args: