Add coverage from issue resolved with tower_role conversion

awx_collection/tests/integration/targets/tower_role/tasks/main.yml

@@ -50,6 +50,18 @@
     that:
       - "result is changed"
 
+- name: Add Joe to workflow execute role, no-op
+  tower_role:
+    user: "{{ username }}"
+    role: execute
+    workflow: test-role-workflow
+    state: present
+  register: result
+
+- assert:
+    that:
+      - "result is not changed"
+
 - name: Delete a User
   tower_user:
     username: "{{ username }}"