add v4 tag to playwright extension

Author: nicktrn

docs/config/extensions/playwright.mdx

@@ -2,8 +2,13 @@
 title: "Playwright"
 sidebarTitle: "playwright"
 description: "Use the playwright build extension to use Playwright with Trigger.dev"
+tag: "v4"
 ---
 
+import UpgradeToV4Note from "/snippets/upgrade-to-v4-note.mdx";
+
+<UpgradeToV4Note />
+
 If you are using [Playwright](https://playwright.dev/), you should use the Playwright build extension.
 
 - Automatically installs Playwright and required browser dependencies