Add mock implementations for permissions module in user API tests

This commit introduces mock functions for the `permissions` module in the user API test file, enhancing test isolation and allowing for comprehensive testing of permission-related functionalities. The new mocks include methods for checking permissions, managing user permissions cache, and resolving permission settings, improving the overall test coverage and reliability of the user API tests.

src/__tests__/users.api.test.js

@@ -13,6 +13,18 @@ jest.unstable_mockModule('../keycloak.js', () => ({
   expressSession: (req, res, next) => next(),
 }));
 
+jest.unstable_mockModule('../database/permissions.js', () => ({
+  checkPermissions: () => (req, res, next) => next(),
+  hasPermission: jest.fn(async () => true),
+  getUserPermissionsCacheKey: jest.fn((userId) => `permissions:${userId}`),
+  saveUserPermissionsToRedis: jest.fn(),
+  applyPermissionSettingsList: jest.fn(() => ({})),
+  getPermissionSettingsId: jest.fn(),
+  excludeIdFromList: jest.fn((items = []) => items),
+  resolveReferencedDocs: jest.fn(async () => []),
+  resolvePermissionSettings: jest.fn(async () => []),
+}));
+
 // Mock database connections and initializations in index.js
 jest.unstable_mockModule('../database/mongo.js', () => ({
   dbConnect: jest.fn(),