Add idempotency check to getUserAgentWithOrchestrationId — if the
tag is already present in baseUserAgent, return it unchanged. This
prevents doubling when both the exported helper and getOctokitOptions
run for the same client.
When ACTIONS_ORCHESTRATION_ID is set, appends
actions_orchestration_id/{sanitizedId} to the user-agent string.
- Add getUserAgentWithOrchestrationId() to internal/utils.ts
- Wire into getOctokitOptions() so all getOctokit() calls include it
- Re-export helper from @actions/github/lib/utils for downstream consumers
- 14 deterministic unit tests covering helper, integration, edge cases