fix(ui): slow down and ease transition on test-results-bar

Increase the transition duration from 100ms to 200ms and add an
ease-out timing function to smooth the height animation in the test
results bar. This improves the visual experience when resizing the
component by making the animation less abrupt.

Author: rohitpaulk

app/components/course-page/test-results-bar/index.hbs

@@ -18,7 +18,7 @@
   {{/if}}
 
   <div
-    class="relative w-full flex flex-col grow overflow-auto {{unless this.isResizing 'transition-[height] duration-100'}}"
+    class="relative w-full flex flex-col grow overflow-auto {{unless this.isResizing 'transition-[height] duration-200 ease-out'}}"
     style={{this.expandedContainerStyle}}
     data-test-contents
   >