rename references to user_email to username

lib/galaxy/selenium/navigates_galaxy.py

@@ -576,7 +576,7 @@ class NavigatesGalaxy(HasDriver):
             # Make sure the user menu was dropped down
             user_menu = self.components.masthead.user_menu.wait_for_visible()
             try:
-                username_element = self.components.masthead.user_email.wait_for_visible()
+                username_element = self.components.masthead.username.wait_for_visible()
             except self.TimeoutException as e:
                 menu_items = user_menu.find_elements_by_css_selector("li a")
                 menu_text = [mi.text for mi in menu_items]

lib/galaxy/selenium/navigation.yml

@@ -39,7 +39,7 @@ masthead:
     user_menu: '#user .dropdown-menu a'
     workflow: '#workflow .nav-link'
 
-    user_email:
+    username:
       type: xpath
       selector: '//a[contains(text(), "Logged in as")]'
 

lib/galaxy_test/selenium/test_registration.py

@@ -26,7 +26,7 @@ class RegistrationTestCase(SeleniumTestCase):
         self.logout_if_needed()
         assert not self.is_logged_in()
         self.home()
-        self.components.masthead.user_email.assert_absent_or_hidden()
+        self.components.masthead.username.assert_absent_or_hidden()
 
     @selenium_test
     def test_reregister_email_fails(self):