feat: Implement NotifyPanelComponent with unit tests and mock API service

- Added NotifyPanelComponent for managing notification channels and rules.
- Implemented reactive forms for channel and rule management.
- Created unit tests for NotifyPanelComponent to validate functionality.
- Developed MockNotifyApiService to simulate API interactions for testing.
- Added mock data for channels, rules, and deliveries to facilitate testing.
- Introduced RuntimeEventFactoryTests to ensure correct event creation with build ID.

src/StellaOps.Scanner.WebService/Contracts/RuntimePolicyContracts.cs

@@ -69,6 +69,10 @@ public sealed record RuntimePolicyImageResponseDto
     [JsonPropertyName("metadata")]
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     public string? Metadata { get; init; }
+
+    [JsonPropertyName("buildIds")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public IReadOnlyList<string>? BuildIds { get; init; }
 }
 
 public sealed record RuntimePolicyRekorDto