Revert "Remove jupyter from the extension pack. (#17080)" (#17129)

This reverts commit 84f4fcc.

Author: karthiknadig

gulpfile.js

@@ -80,7 +80,7 @@ async function addExtensionPackDependencies() {
     // extension dependencies need not be installed during development
     const packageJsonContents = await fsExtra.readFile('package.json', 'utf-8');
     const packageJson = JSON.parse(packageJsonContents);
-    packageJson.extensionPack = ['ms-python.vscode-pylance'].concat(
+    packageJson.extensionPack = ['ms-toolsai.jupyter', 'ms-python.vscode-pylance'].concat(
         packageJson.extensionPack ? packageJson.extensionPack : [],
     );
     await fsExtra.writeFile('package.json', JSON.stringify(packageJson, null, 4), 'utf-8');