fix(instanceUrl): heuristic now supports git remote URLs

See merge request !166

fix: some self-managed GitLab deployments not handling project URLs

See merge request !168

fix(gitlab_service): include request URL when logging error

See merge request !167

Merge branch '275-api-request-failed-when-trying-to-get-current-project-because-error-404-project-not-found' into 'main'

fix(gitlab-service): do not fail if project could not be found

See merge request !130

This is the first step in not swallowing critical errors deep in
the GitService. It allows us to follow the error path for each
public function separately.

fix(git_service): throw errors when git command fails, don't return null

See merge request gitlab-org/gitlab-vscode-extension!169

refactor(gitlab_project): fetch project.webUrl to fix openers

See merge request !171