ci: add rolling to workflow branch triggers ahead of current→rolling rename

Defensive pre-flight for the planned rename of the default branch from
current to rolling. Adds rolling alongside current to push/pull-request
triggers and to the manual dispatch choice list so workflows continue to
fire across the rename atomically.

Workflow input defaults remain on current — they will be flipped, and
current dropped, in the post-rename cleanup PR. Cosmetic naming
(submodules.yml job/branch names, conf.py fallback, README, PR template
link) is intentionally deferred to that cleanup PR to avoid documenting
a branch that does not yet exist.

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