Add unit tests for PackRunAttestation and SealedInstallEnforcer

- Implement comprehensive tests for PackRunAttestationService, covering attestation generation, verification, and event emission.
- Add tests for SealedInstallEnforcer to validate sealed install requirements and enforcement logic.
- Introduce a MonacoLoaderService stub for testing purposes to prevent Monaco workers/styles from loading during Karma runs.

src/Cli/StellaOps.Cli/Services/MigrationModuleRegistry.cs

@@ -1,6 +1,5 @@
 using System.Reflection;
 using StellaOps.Authority.Storage.Postgres;
-using StellaOps.Concelier.Storage.Postgres;
 using StellaOps.Excititor.Storage.Postgres;
 using StellaOps.Notify.Storage.Postgres;
 using StellaOps.Policy.Storage.Postgres;
@@ -35,11 +34,6 @@ public static class MigrationModuleRegistry
             SchemaName: "scheduler",
             MigrationsAssembly: typeof(SchedulerDataSource).Assembly,
             ResourcePrefix: "StellaOps.Scheduler.Storage.Postgres.Migrations"),
-        new(
-            Name: "Concelier",
-            SchemaName: "vuln",
-            MigrationsAssembly: typeof(ConcelierDataSource).Assembly,
-            ResourcePrefix: "StellaOps.Concelier.Storage.Postgres.Migrations"),
         new(
             Name: "Policy",
             SchemaName: "policy",