Use vscode builtins extension pack in example applications

[marcdumais-work]

Use the vscode built-ins pack in example apps

Feature Description:

Theia now supports using vscode extensions packs, and the vscode built-in extensions we publish on open-vsx, have such a pack. We could easily replace the current vscode built-ins with such a pack.

example: https://github.com/eclipse-theia/theia-blueprint/blob/master/applications/electron/package.json#L121-L122

We may need to exclude a couple of built-ins, like so: https://github.com/eclipse-theia/theia-blueprint/blob/master/applications/electron/package.json#L129-L132

[vince-fugnitto]

@marcdumais-work just to mention I have the following pull-request #10049 but didn't get around to fixing the issues as to why the api-tests would fail for typescript.

[marcdumais-work]

Duplicate of #9985