Fix route hydration with ssg without early chunk commit (#4654)

* Fix route hydration with ssg without early chunk commit

* fix clobbered port for fullstack spread (merge conflict)

* wait for hydration

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/playwright-tests/fullstack-spread.spec.js

@@ -2,11 +2,14 @@
 const { test, expect } = require("@playwright/test");
 
 test("spread attributes hydrate", async ({ page }) => {
-  await page.goto("http://localhost:7979");
+  await page.goto("http://localhost:7980");
+
+  await page.waitForTimeout(2000); // wait for hydration
 
   // Expect the page to contain the button
   const counter = page.locator("#counter");
   await expect(counter).toHaveText("Count: 0");
+
   // Clicking on the button should increment the count
   await counter.click();
   await expect(counter).toHaveText("Count: 1");