Add unit tests for SBOM ingestion and transformation

- Implement `SbomIngestServiceCollectionExtensionsTests` to verify the SBOM ingestion pipeline exports snapshots correctly.
- Create `SbomIngestTransformerTests` to ensure the transformation produces expected nodes and edges, including deduplication of license nodes and normalization of timestamps.
- Add `SbomSnapshotExporterTests` to test the export functionality for manifest, adjacency, nodes, and edges.
- Introduce `VexOverlayTransformerTests` to validate the transformation of VEX nodes and edges.
- Set up project file for the test project with necessary dependencies and configurations.
- Include JSON fixture files for testing purposes.

deploy/compose/docker-compose.airgap.yaml

@@ -235,8 +235,8 @@ services:
       - authority
     environment:
       DOTNET_ENVIRONMENT: Production
-    volumes:
-      - ../../etc/notify.prod.yaml:/app/etc/notify.yaml:ro
+    volumes:
+      - ../../etc/notify.airgap.yaml:/app/etc/notify.yaml:ro
     ports:
       - "${NOTIFY_WEB_PORT:-9446}:8446"
     networks: