when doing git clone https://gitlab-ci-token:RUNNER_TOKEN@GITLAB_URL/NAMESPACE/PROJECT.git
user is always gitlab-ci-token and cannot be used to identify the project, runner token
is not unique per project.

If two projects in the namespace has the same token and the wrong project is returned by
`build_access_token_check` method, gitlab will simply return 404.

`build_access_token_check` now take namespace_id as parameter so that we can ensure that
we authenticate on the right project.