Not sure how this NPE could happen, but don't fail to render search results when it does

Addresses #53896

WIth TS 3.0, we don't need to pass a js or ts file for the project

Fixes https://github.com/Microsoft/TypeScript/issues/25466

* use alt to focus the menu and and navigation

* updating action runner to return focus properly and set state

* return focus in any case of lost focus
except intentionally focusing elsewhere

* convert SetTimeout to RunOnceScheduler to fix builder issue

move breadcrumbs into title control, enable different style depending on tabs vs no-tabsfor a start breadcrumbs only show with tabs enabled

Use HTML headings for viewlet titles.