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.

NuGet.config

@@ -6,6 +6,7 @@
   <packageSources>
     <clear />
     <add key="local" value="local-nuget" />
+    <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
   </packageSources>
   <packageSourceMapping>
@@ -30,6 +31,11 @@
       <package pattern="System.Memory" />
       <package pattern="System.Runtime.CompilerServices.Unsafe" />
     </packageSource>
+    <packageSource key="dotnet-public">
+      <package pattern="Microsoft.Extensions.*" />
+      <package pattern="Microsoft.AspNetCore.*" />
+      <package pattern="Microsoft.Data.Sqlite" />
+    </packageSource>
     <packageSource key="nuget.org">
       <package pattern="*" />
     </packageSource>