Revert "Skip heartbeat on /healthz endpoint (#2332)"

This reverts commit 037a0e0.

Author: code-asher

src/node/routes/index.ts

@@ -66,11 +66,7 @@ export const register = async (
   app.use(bodyParser.urlencoded({ extended: true }))
 
   const common: express.RequestHandler = (req, _, next) => {
-    // /healthz|/healthz/ needs to be excluded otherwise health checks will make
-    // it look like code-server is always in use.
-    if (!/^\/healthz\/?$/.test(req.url)) {
-      heart.beat()
-    }
+    heart.beat()
 
     // Add common variables routes can use.
     req.args = args