Fix IE11 tests for BrowserStack environment (#10959)

uitest/src/main/java/com/vaadin/tests/contextclick/GridContextClick.java

         grid.addColumn(person -> String.valueOf(person.getAddress().getCity()))
                 .setCaption("City");
 
-        // grid.setFooterVisible(true);
-        // grid.appendFooterRow();
+        grid.setFooterVisible(true);
+        grid.appendFooterRow();
 
         // grid.setColumnOrder("address", "email", "firstName", "lastName",
         // "phoneNumber", "address.streetAddress", "address.postalCode",

uitest/src/test/java/com/vaadin/tests/application/CriticalNotificationsTest.java

 
 public class CriticalNotificationsTest extends MultiBrowserThemeTest {
 
-    @Override
-    protected boolean useNativeEventsForIE() {
-        if (BrowserUtil.isIE(getDesiredCapabilities(), 11)) {
-            // Use JavaScript events only for IE11
-            return false;
-        } else {
-            return true;
-        }
-    }
-
     @Test
     public void internalError() throws Exception {
         testCriticalNotification("Internal error");

uitest/src/test/java/com/vaadin/tests/components/treegrid/TreeGridBasicFeaturesTest.java

                 .isElementPresent(By.className("v-treegrid-expander")));
     }
 
-    @Override
-    protected boolean useNativeEventsForIE() {
-        // Fixes IE11 selectMenuPath troubles
-        return false;
-    }
-
     @Test
     public void expand_and_collapse_listeners() {
         selectMenuPath("Component", "State", "Expand listener");

uitest/src/test/java/com/vaadin/tests/contextclick/AbstractContextClickTest.java

     private Pattern defaultLog = Pattern
             .compile("[0-9]+. ContextClickEvent: [(]([0-9]+), ([0-9]+)[)]");
 
-    @Override
-    protected boolean useNativeEventsForIE() {
-        return false;
-    }
-
     @Override
     public List<DesiredCapabilities> getBrowsersToTest() {
         return getBrowsersSupportingContextMenu();

uitest/src/test/java/com/vaadin/tests/contextclick/GridContextClickTest.java

     }
 
     @Test
-    @Ignore("Footer is not currently implemented in grid")
     public void testFooterContextClickWithTypedListener() {
         addOrRemoveTypedListener();
 
         contextClick($(GridElement.class).first().getFooterCell(0, 0));
 
         assertEquals(
-                "1. ContextClickEvent value: , column: Address, section: FOOTER",
+                "1. ContextClickEvent value: Address, column: Address, section: FOOTER",
                 getLogRow(0));
 
         contextClick($(GridElement.class).first().getFooterCell(0, 3));
 
         assertEquals(
-                "2. ContextClickEvent value: , column: Last Name, section: FOOTER",
+                "2. ContextClickEvent value: Last Name, column: Last Name, section: FOOTER",
                 getLogRow(0));
     }