[fenix] No issue: re-enable libraryMenuItemsTest and backButtonTest (https://github.com/mozilla-mobile/fenix/pull/9639)

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

@@ -3,7 +3,6 @@ package org.mozilla.fenix.ui
 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
@@ -37,7 +36,6 @@ class LibraryMenuTest {
     }
 
     @Test
-    @Ignore("Intermittently failing. See https://github.com/mozilla-mobile/fenix/issues/9287")
     fun libraryMenuItemsTest() {
         navigationToolbar {
         }.enterURLAndEnterToBrowser(defaultWebPage.url) {
@@ -52,7 +50,6 @@ class LibraryMenuTest {
     }
 
     @Test
-    @Ignore("Intermittent failure.  See https://github.com/mozilla-mobile/fenix/issues/9232")
     fun backButtonTest() {
         navigationToolbar {
         }.enterURLAndEnterToBrowser(defaultWebPage.url) {