Fixes test problem on WSL

The extraction logic failed to extract the GitLab URI correctly
when the configured platform endpoint does not have a trailing
slash. This commit changes the logic to handle scenarios with
and without trailing slash

Fixes #4270

* refactor: upstream github-url-from-git typing to definitely typed

* Update package.json

* chore: update yarn lock

fix: Registry failure on HTTP status =500

See https://git-scm.com/docs/git-clone#Documentation/git-clone.txt---recurse-submodulesltpathspec

Fixes #1356

Also convert usage of chai to jest