Don't cancel pipelines when CI_COMMIT_REF_NAME matches a branch 'OSNAME/'

This happens when creating merge request to backport changes, like for instance creating a merge request from apertis/v2025pre to apertis/v2024-updates. In this case, the tool may cancel a legitimate pipeline running on apertis/v2024-updates.

Fix: apertis-issues#661 (closed)

Signed-off-by: Dylan Aïssi dylan.aissi@collabora.com