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/cargo/tasks/test_directory.yml

@@ -24,7 +24,7 @@
         path: "{{ manifest_path }}"
         regexp: '^version = ".*"$'
         line: 'version = "1.0.0"'
-    
+
     - name: Ensure package is uninstalled
       community.general.cargo:
         name: "{{ package_name }}"