Feature: Support closing dialog windows (#233)

Supports closing dialogs in development. Upgrades gas-client to 1.2.0 and uses new API here: Add scriptHostFunctions for google.script.host gas-client#36
Example button to close dialog in Bootstrap sample
Updates integration tests

test/local-development.test.js

@@ -26,7 +26,7 @@ const srcTestFile = path.join(
   '../src/client/dialog-demo-bootstrap/components/SheetEditor.jsx'
 );
 
-const webpackDevServerReady = async (process) => {
+const viteDevServerReady = async (process) => {
   console.log('Waiting for vite to serve...');
   return new Promise((resolve) => {
     process.stdout.on('data', (data) => {
@@ -40,7 +40,7 @@ const webpackDevServerReady = async (process) => {
 describe(`Local setup ${isExtended ? '*extended*' : ''}`, () => {
   let page;
   let process;
-  const containerSelector = isExtended ? '.script-app-dialog' : 'body';
+  const containerSelector = isExtended ? 'div[role="dialog"]' : 'body';
 
   beforeAll(async () => {
     process = exec('yarn dev');
@@ -52,7 +52,7 @@ describe(`Local setup ${isExtended ? '*extended*' : ''}`, () => {
       deviceScaleFactor: 1,
     });
 
-    await webpackDevServerReady(process);
+    await viteDevServerReady(process);
 
     if (isExtended) {
       await openAddon(page);