[Bug] Click "Reload required" after uninstalling extension blows up

Description

Noticed while testing Add Extensions Marketplace in Web IDE (gitlab!151352 - merged) locally:

1. With extensions marketplace enabled, install an extension that requires reload on uninstall (like vscodevim)
2. View the extension and click Uninstall
3. Click Reload required
4. Web IDE blows up 😞

web_ide_reload_required_bug

Investigation

• This might have something to do with the workspaceProvider.open we provide https://gitlab.com/gitlab-org/gitlab-web-ide/-/blob/51f9e91f890752596e7a3ef51f436fea07885eff/packages/vscode-bootstrap/src/start.ts#L297
• Maybe there's something we can do with our onWillShutdown handling here https://gitlab.com/gitlab-org/gitlab-web-ide/-/blob/51f9e91f890752596e7a3ef51f436fea07885eff/packages/vscode-bootstrap/src/start.ts#L184