Add mock for Element.scrollIntoView to fix tests.

Signed-off-by: Sydney Achinger <sydneynicoleachinger@spotify.com>

plugins/techdocs/src/reader/components/TechDocsReaderPage/TechDocsReaderPage.test.tsx

@@ -91,6 +91,8 @@ const configApi = new MockConfigApi({
   },
 });
 
+Element.prototype.scrollIntoView = jest.fn();
+
 const Wrapper = ({ children }: { children: React.ReactNode }) => {
   return (
     <TestApiProvider

plugins/techdocs/src/reader/components/TechDocsReaderPageContent/TechDocsReaderPageContent.tsx

@@ -86,10 +86,8 @@ export const TechDocsReaderPageContent = withTechDocsReaderProvider(
     const [hashElement] = useShadowRootElements([`[id="${hash.slice(1)}"]`]);
 
     useEffect(() => {
-      if (hashElement) {
-        if (!isStyleLoading) {
-          hashElement.scrollIntoView();
-        }
+      if (hashElement && !isStyleLoading) {
+        hashElement.scrollIntoView();
       } else {
         document?.querySelector('header')?.scrollIntoView();
       }