Add a bit of spacing before Installed extensions title (#7152)

* Add a bit of spacing before Installed extensions title

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Update snapshot

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

---------

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

packages/core/src/features/extensions/__snapshots__/navigation-using-application-menu.test.ts.snap

@@ -423,6 +423,9 @@ exports[`extensions - navigation using application menu when navigating to exten
                   : you can drag and drop a tarball file to this area
                 </small>
               </section>
+              <div
+                class="size-md"
+              />
               <div>
                 <div
                   class="Spinner singleColor center"