refactor: rewrite create-app-auth-client mutation as REST endpoint

packages/web/src/hooks/useAdminCreateAppAuthClient.ee.js

@@ -0,0 +1,21 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+import api from 'helpers/api';
+
+export default function useAdminCreateAppAuthClient(appKey) {
+  const queryClient = useQueryClient();
+
+  const query = useMutation({
+    mutationFn: async (payload) => {
+      const { data } = await api.post(`/v1/admin/apps/${appKey}/auth-clients`, payload);
+
+      return data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        queryKey: ['admin', 'apps', appKey, 'authClients'],
+      });
+    }
+  });
+
+  return query;
+}