release-notes CI template: allow 'git fetch --unshallow' to fail

Thomas Morinrequested to merge
allow-unshallow-fail into main

The git fetch --unshallow will fail on a repo that has a small history and for which gitlab has pulled the complete repo.

from https://gitlab.com/sylva-projects/sylva-elements/container-images/rke2-in-docker/-/jobs/7696065639#L21:

$ git fetch --unshallow
fatal: --unshallow on a complete repository does not make sense

This MR fixes this issue by allowing this command to fail.

Edited by Thomas Morin

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