Remove sidebar menus in favor of lil' popovers (#3046)

* Convert user menu to a popover from a sidebar

* Move the user menu over to the left menu cluster

* Replace project sidebar with popover-style menu

* Styling tweaks, give export button a proper tooltip when disabled

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Filter orphan breaks, tweak space to remove mouse gaps

* Unify with and without avatar image code

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Rerun CI

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Rerun CI

* Prepare to move UserSidebarMenu over to right

* Revert AppHeader tweaks

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Rerun CI

* Fix typo in README

* Fix export E2E tests that relied on button text

* Missed the data-testid we used to have on the data-testid we had on the settings button

* Dang I missed another testId

* Update snapshots

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Rerun CI

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/components/AppHeader.tsx

@@ -49,9 +49,9 @@ export const AppHeader = ({
           <>
             <CommandBarOpenButton />
             <RefreshButton />
-            <UserSidebarMenu user={user} />
           </>
         )}
+        <UserSidebarMenu user={user} />
       </div>
     </header>
   )