Fix: editor adding blocks UI tests

Author: hassaanelgarem

WordPress/UITestsFoundation/Screens/Editor/BlockEditorScreen.swift

@@ -39,6 +39,9 @@ public class BlockEditorScreen: ScreenObject {
      */
     public func enterTextInTitle(text: String) -> BlockEditorScreen {
         let titleView = app.otherElements["Post title. Empty"].firstMatch // Uses a localized string
+        guard titleView.waitForExistence(timeout: 3) else {
+            return self
+        }
 
         titleView.tap()
         titleView.typeText(text)