update search based on pr feedback:

- fix InventoryHost list inadverdent breakage due to merge conflict
- update label__name search key to labels__name
- always snap to page 1 when a search happens
- udpate capitalization of keys to be consistent
- remove isDefault from sort col items in tests

awx/ui_next/src/components/Lookup/MultiCredentialsLookup.jsx

@@ -129,11 +129,11 @@ function MultiCredentialsLookup(props) {
                     isDefault: true
                   },
                   {
-                    name: i18n._(t`Created by (username)`),
+                    name: i18n._(t`Created By (Username)`),
                     key: 'created_by__username',
                   },
                   {
-                    name: i18n._(t`Modified by (username)`),
+                    name: i18n._(t`Modified By (Username)`),
                     key: 'modified_by__username',
                   },
                 ]}