gitlab: Fix pipeline generation for non-develop protected pipelines (#31378)

Release branches and tags run protected pipelines, and we noticed
that those pipelines were generating all jobs in the stack, even
when the mirror contained all the built specs and an up to date
index.  The problem was caused because the override mirror was
not present in spacks mirror configuration at the time when the
binary_distribution.update() method was called.  This fixes that
by always adding the mirror override, if present, to the list of
configured mirrors.

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