Remove todo items related to changes in use of className prop

In Carbon v11 a number of components have changed their use of the
className prop. To improve consistency it is now applied to the
outermost element rendered by the component.

Verified that we don't currently use the className prop on any of
the TooltipDropdown instances, and existing use of the className prop
on our tables still works with the new changes.

packages/components/src/components/TooltipDropdown/TooltipDropdown.jsx

@@ -70,7 +70,7 @@ const TooltipDropdown = ({
 
   return (
     <ComboBox
-      className={className} // TODO: carbon11 - Step 6 - className now applies to the outermost element
+      className={className}
       disabled={disabled}
       id={id}
       inline={inline}

src/containers/ClusterTasks/ClusterTasks.jsx

@@ -230,8 +230,6 @@ function ClusterTasksContainer() {
     }
   ];
 
-  // TODO: carbon11 - Step 6 - className now applies to the outermost element of Table
-
   return (
     <ListPageLayout
       error={getError()}

src/containers/Pipelines/Pipelines.jsx

@@ -257,8 +257,6 @@ export function Pipelines() {
     }
   ];
 
-  // TODO: carbon11 - Step 6 - className now applies to the outermost element of Table
-
   return (
     <ListPageLayout
       error={getError()}

src/containers/Tasks/Tasks.jsx

@@ -255,8 +255,6 @@ function Tasks() {
     }
   ];
 
-  // TODO: carbon11 - Step 6 - className now applies to the outermost element of Table
-
   return (
     <ListPageLayout
       error={getError()}

src/containers/YAMLEditor/YAMLEditor.jsx

@@ -151,8 +151,7 @@ export default function YAMLEditor({
             lowContrast
           />
         )}
-        {/* TODO: carbon11 - Step 6 - className now applies to the outermost element of FormGroup */}
-        <FormGroup legendText="" className="tkn--codemirror--form">
+        <FormGroup legendText="">
           {loading ? (
             <Loading message={loadingMessage} />
           ) : (