feat: Enhance MongoDB storage with event publishing and outbox support

- Added `MongoAdvisoryObservationEventPublisher` and `NatsAdvisoryObservationEventPublisher` for event publishing.
- Registered `IAdvisoryObservationEventPublisher` to choose between NATS and MongoDB based on configuration.
- Introduced `MongoAdvisoryObservationEventOutbox` for outbox pattern implementation.
- Updated service collection to include new event publishers and outbox.
- Added a new hosted service `AdvisoryObservationTransportWorker` for processing events.

feat: Update project dependencies

- Added `NATS.Client.Core` package to the project for NATS integration.

test: Add unit tests for AdvisoryLinkset normalization

- Created `AdvisoryLinksetNormalizationConfidenceTests` to validate confidence score calculations.

fix: Adjust confidence assertion in `AdvisoryObservationAggregationTests`

- Updated confidence assertion to allow a range instead of a fixed value.

test: Implement tests for AdvisoryObservationEventFactory

- Added `AdvisoryObservationEventFactoryTests` to ensure correct mapping and hashing of observation events.

chore: Configure test project for Findings Ledger

- Created `Directory.Build.props` for test project configuration.
- Added `StellaOps.Findings.Ledger.Exports.Unit.csproj` for unit tests related to findings ledger exports.

feat: Implement export contracts for findings ledger

- Defined export request and response contracts in `ExportContracts.cs`.
- Created various export item records for findings, VEX, advisories, and SBOMs.

feat: Add export functionality to Findings Ledger Web Service

- Implemented endpoints for exporting findings, VEX, advisories, and SBOMs.
- Integrated `ExportQueryService` for handling export logic and pagination.

test: Add tests for Node language analyzer phase 22

- Implemented `NodePhase22SampleLoaderTests` to validate loading of NDJSON fixtures.
- Created sample NDJSON file for testing.

chore: Set up isolated test environment for Node tests

- Added `node-isolated.runsettings` for isolated test execution.
- Created `node-tests-isolated.sh` script for running tests in isolation.

src/Concelier/StellaOps.Concelier.WebService/Program.cs

@@ -106,6 +106,15 @@ builder.Services.AddMongoStorage(storageOptions =>
     storageOptions.DatabaseName = concelierOptions.Storage.Database;
     storageOptions.CommandTimeout = TimeSpan.FromSeconds(concelierOptions.Storage.CommandTimeoutSeconds);
 });
+builder.Services.AddOptions<AdvisoryObservationEventPublisherOptions>()
+    .Bind(builder.Configuration.GetSection("advisoryObservationEvents"))
+    .PostConfigure(options =>
+    {
+        options.Subject ??= "concelier.advisory.observation.updated.v1";
+        options.Stream ??= "CONCELIER_OBS";
+        options.Transport = string.IsNullOrWhiteSpace(options.Transport) ? "mongo" : options.Transport;
+    })
+    .ValidateOnStart();
 builder.Services.AddConcelierAocGuards();
 builder.Services.AddConcelierLinksetMappers();
 builder.Services.AddAdvisoryRawServices();