Fix missing async/await in vite-plugin-integrations-container on astro:server:setup hook (#8104)

* All astro integrations hooks are defined as returning void|Promise, so
all calls need to deal with a possible async/await pattern.  One was
missed in vite-plugin-integrations-container.

This plugin is definitely used by the astro-dev when using a node
adapter, but I am not sure about other such scenarios.  I did a search
through the code base, and all other runHook* calls are properly
awaited.

* chore: make test async

---------

Co-authored-by: Nate Moore <nate@astro.build>

packages/astro/src/vite-plugin-integrations-container/index.ts

@@ -16,9 +16,9 @@ export default function astroIntegrationsContainerPlugin({
 }): VitePlugin {
 	return {
 		name: 'astro:integration-container',
-		configureServer(server) {
+		async configureServer(server) {
 			if (server.config.isProduction) return;
-			runHookServerSetup({ config: settings.config, server, logging });
+			await runHookServerSetup({ config: settings.config, server, logging });
 		},
 		async buildStart() {
 			if (settings.injectedRoutes.length === settings.resolvedInjectedRoutes.length) return;

packages/astro/test/fixtures/integration-server-setup/integration.js

@@ -1,8 +1,12 @@
+import { setTimeout } from "node:timers/promises";
+
 export default function() {
 	return {
 		name: '@astrojs/test-integration',
 		hooks: {
-			'astro:server:setup': ({ server }) => {
+			'astro:server:setup': async ({ server }) => {
+				// Ensure that `async` is respected
+				await setTimeout(100);
 				server.middlewares.use(
 					function middleware(req, res, next) {
 						res.setHeader('x-middleware', 'true');