GitLab connector: add GitLab additional group with role (#2941)

Signed-off-by: zvlb <vl.zemtsov@gmail.com>
Signed-off-by: Maksim Nabokikh <maksim.nabokikh@flant.com>
Signed-off-by: Maksim Nabokikh <max.nabokih@gmail.com>
Co-authored-by: Maksim Nabokikh <maksim.nabokikh@flant.com>
Co-authored-by: Maksim Nabokikh <max.nabokih@gmail.com>