Setting modification to address requests from UI_NEXT devs (#14996)

Modification to settings

- Add hidden to indicate to UI_NEXT to hide the field
- Add warning_text to indicate to UI_NEXT to display the warning when specific setting is modified
- Address some non required field being marked as required

awx/ui/conf.py

@@ -59,6 +59,7 @@ register(
     help_text=_('Maximum number of job events for the UI to retrieve within a single request.'),
     category=_('UI'),
     category_slug='ui',
+    hidden=True,
 )
 
 register(
@@ -68,4 +69,5 @@ register(
     help_text=_('If disabled, the page will not refresh when events are received. Reloading the page will be required to get the latest details.'),
     category=_('UI'),
     category_slug='ui',
+    hidden=True,
 )