Added tab press to select autocomplete

Resovles #7132

Auditors: @srirambv @bsclifton

Test Plan:
- Ensure you have auto complete suggestion for on an input filed
- Press down on the input field to highlight the suggestion
- Once highlighted press tab, field should be filled

js/components/contextMenu.js

@@ -276,7 +276,11 @@ class ContextMenu extends ImmutableComponent {
 
     switch (e.keyCode) {
       case keyCodes.ENTER:
-        e.preventDefault()
+      case KeyCodes.TAB:
+        if (e.keyCode === keyCodes.ENTER) {
+          e.preventDefault()
+        }
+
         e.stopPropagation()
         if (currentIndex !== null) {
           const action = selectedTemplate.getIn([currentIndex, 'click'])
@@ -288,7 +292,6 @@ class ContextMenu extends ImmutableComponent {
         break
 
       case KeyCodes.ESC:
-      case KeyCodes.TAB:
         windowActions.resetMenuState()
         break