Part of #53274
Fixes #55344

Allow users to see installed extensions while offline

* Polish tag search as per feedback

* Updated regex

This is already handled by using a resource map

Instead, we should always use the casing of the first file we see with a given path

* Add setting to turn off automatic checking of extension updates

* update tag name

* Fix tests

A project reference may point either to a tsconfig or to a folder containing a `tsconfig.json` file