Add storage location and notification subscription API

[snamber]

Separate storage management from AutomationService into StorageLocationService and storage_location.proto.

Add typed provider references, location rename, SNS/Pub/Sub/Event Grid subscriptions, and location-scoped event history with descending pagination and triggered job/automation IDs. Azure delivery secrets are returned only on creation. StorageLocation.reference remains optional for legacy automation requests; CreateStorageLocationRequest requires it.

Compatibility notes:

• Existing storage field numbers and provider enum numbers are preserved.
• The approved enum renames GCS → GCS_BUCKET, S3 → AWS_S3_BUCKET, and FS → FILESYSTEM are JSON/source compatibility breaks. Buf WIRE_JSON breaking reports these three changes; no override has been applied.
• Storage RPCs move from AutomationService to StorageLocationService. The pending Core implementation retains legacy route aliases, but does not translate the old CreateStorageLocation request payload.

Validation: Buf 1.73.0 format, lint, and build pass; git diff --check passes. Core clients were regenerated and tested locally.

Rollout: merge and publish this API first. Core dependency updates and its PR will follow only after publication is confirmed. No Core PR or deployment is included here.

[github-actions]

The latest Buf updates on your PR. Results from workflow Lint Protobuf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	⏩ skipped	Oct 2, 2026, 12:15 PM