[fenix] Disable failing verifyUndoSnackBarTest UI test

app/src/androidTest/java/org/mozilla/fenix/ui/TabbedBrowsingTest.kt

@@ -10,6 +10,7 @@ import com.google.android.material.bottomsheet.BottomSheetBehavior
 import okhttp3.mockwebserver.MockWebServer
 import org.junit.After
 import org.junit.Before
+import org.junit.Ignore
 import org.junit.Rule
 import org.junit.Test
 import org.mozilla.fenix.helpers.AndroidAssetDispatcher
@@ -171,6 +172,7 @@ class TabbedBrowsingTest {
         }
     }
 
+    @Ignore("Currently failing, will need some investigation, see https://github.com/mozilla-mobile/fenix/issues/22640")
     @Test
     fun verifyUndoSnackBarTest() {
         // disabling these features because they interfere with the snackbar visibility