Remove and prevent trailing whitespace (#10199)

* Remove trailing whitespace.

* Add no-trailing-whitespace extra test.

* Re-add needed trailing whitespace.

* Remove one more trailing whitespace.

tests/integration/targets/homebrew/tasks/casks.yml

@@ -97,10 +97,10 @@
         - package_result is not changed
 
   # This crashed on 4867eb4 - Ref: issue #9777
-  - name: Install cask using homelab/cask syntax 
-    homebrew: 
+  - name: Install cask using homelab/cask syntax
+    homebrew:
       package: "homebrew/cask/{{ package_name }}"
       state: present
       update_homebrew: false
-    become: true 
+    become: true
     become_user: "{{ brew_stat.stat.pw_name }}"