fix(site/e2e): increase webServer timeout to 120s (#22731)

The Playwright e2e `webServer` starts the Coder server via
`go run -tags embed`, which must compile before serving. The default 60s
timeout leaves no margin when the CI runner is slow.

Failed run:
https://github.com/coder/coder/actions/runs/22782592241/job/66091950715

Successful run:
https://github.com/coder/coder/actions/runs/22782107623/job/66090828826

The server started and printed its banner, but with only ~4s left on the
clock the health check (`/api/v2/deployment/config`) could not complete
before the timeout fired. The same ~2x slowdown shows in the
`make site/e2e/bin/coder` step (45s vs 67s), confirming this is runner
performance variability.

Increase timeout to 120s.

Refs #22727

site/e2e/playwright.config.ts

@@ -66,6 +66,9 @@ export default defineConfig({
 	},
 	webServer: {
 		url: `http://localhost:${coderPort}/api/v2/deployment/config`,
+		// The default timeout is 60s, but `go run` compilation with the
+		// embed tag can take longer on CI.
+		timeout: 120_000,
 		command: [
 			`go run -tags embed ${path.join(__dirname, "../../enterprise/cmd/coder")}`,
 			"server",