LibWeb: Add a test for history.pushState() that uses setTimeout()

Author: https://github.com/kalenikaliaksandr
Commit: 188775c4e3
Pull-request: https://github.com/SerenityOS/serenity/pull/23853

Tests/LibWeb/Text/expected/navigation/history-replace-push-state-race-2.txt

@@ -0,0 +1 @@
+test done!

Tests/LibWeb/Text/input/navigation/history-replace-push-state-race-2.html

@@ -0,0 +1,22 @@
+<script src="../include.js"></script>
+<script>
+    asyncTest(done => {
+        let counter = 0;
+        setTimeout(() => {
+            history.pushState({}, "test", "history-replace-push-state-race-2.html");
+            counter++;
+            if (counter === 2) {
+                println("test done!");
+                done();
+            }
+        }, 0);
+        setTimeout(() => {
+            history.pushState({}, "test", "history-replace-push-state-race-2.html");
+            counter++;
+            if (counter === 2) {
+                println("test done!");
+                done();
+            }
+        }, 0);
+    });
+</script>