fix: make Jest fake timers check more robust to other libs that overw…

…rite time functions

Fix #12514

lib/helpers/printJestWarning.js

@@ -9,7 +9,7 @@ if (typeof jest !== 'undefined' && typeof window !== 'undefined') {
     'https://mongoosejs.com/docs/jest.html');
 }
 
-if (typeof jest !== 'undefined' && process.nextTick.toString().indexOf('nextTick') === -1) {
+if (typeof jest !== 'undefined' && setTimeout.clock != null && typeof setTimeout.clock.Date === 'function') {
   utils.warn('Mongoose: looks like you\'re trying to test a Mongoose app ' +
     'with Jest\'s mock timers enabled. Please make sure you read ' +
     'Mongoose\'s docs on configuring Jest to test Node.js apps: ' +