Add create_snapshot privilege (#31086) (#31598)

A new cluster privilege type has been added to ES in [elastic/elasticsearch#35820](https://github.com/elastic/elasticsearch/pull/35820) .

x-pack/plugins/security/public/services/role_privileges.js

@@ -25,6 +25,7 @@ const clusterPrivileges = [
   'manage_rollup',
   'manage_token',
   'manage_saml',
+  'create_snapshot',
 ];
 const indexPrivileges = [
   'all',

x-pack/plugins/security/public/services/shield_privileges.js

@@ -29,6 +29,7 @@ module.constant('shieldPrivileges', {
     'manage_rollup',
     'manage_token',
     'manage_saml',
+    'create_snapshot',
   ],
   indices: [
     'all',

x-pack/plugins/security/public/views/management/edit_role/components/privileges/es/__snapshots__/cluster_privileges.test.tsx.snap

@@ -103,6 +103,10 @@ exports[`it renders without crashing 1`] = `
             "isGroupLabelOption": false,
             "label": "manage_saml",
           },
+          Object {
+            "isGroupLabelOption": false,
+            "label": "create_snapshot",
+          },
         ]
       }
       selectedOptions={Array []}