feat(orbit): add `glab orbit remote dsl` subcommand

Michael Angelo Riverarequested to merge
add-orbit-remote-dsl into main

from agent

Adds glab orbit remote dsl hitting GET /api/v4/orbit/schema/dsl. Body is returned verbatim as a string for agent consumption (raw JSON Schema or TOON).

Built on the merged client-go !2901; now pinned to released v2.30.0.

Relates to gitlab#591015.

Edited by Michael Angelo Rivera

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