Add an E2E test for clicking all the way through the onboarding, restore code pane highlighting in onboarding (#2265)

* Add test clicking through each onboarding step

* Revert "get rid of code pane shit (#2259)"

This reverts commit d341681c0d.

* Fix the missing #code-pane id

* fmt

src/components/ModelingSidebar/ModelingSidebar.tsx

@@ -165,7 +165,11 @@ function ModelingSidebarSection({
         <Tab.Panel key="none" />
         {filteredPanes.map((pane) => (
           <Tab.Panel key={pane.id} className="h-full">
-            <ModelingPane title={pane.title} Menu={pane.Menu}>
+            <ModelingPane
+              id={`${pane.id}-pane`}
+              title={pane.title}
+              Menu={pane.Menu}
+            >
               {pane.Content instanceof Function ? (
                 <pane.Content />
               ) : (