Update lastRegistered initialization and stop method in PipeliningHos…

…tedService

- Initialize _lastRegistered as an empty array instead of a list
- Modify the StopAsync method to assign an empty array to _lastRegistered
- Add import for PackSite.Library.Exceptions.props in PackSite.Libraries.props

src/PackSite.Library.Pipelining.Configuration/Internal/PipeliningHostedService.cs

@@ -19,7 +19,7 @@ internal sealed class PipeliningConfigurationHostedService(
         IPipelineCollection pipelineCollection,
         ILoggerFactory loggerFactory) : IHostedService, IDisposable
     {
-        private IReadOnlyList<PipelineName> _lastRegistered = new List<PipelineName>();
+        private IReadOnlyList<PipelineName> _lastRegistered = [];
         private IDisposable? _optionsMonitor;
 
         private readonly SemaphoreSlim _lock = new(1, 1);
@@ -44,7 +44,7 @@ public async Task StartAsync(CancellationToken cancellationToken)
         /// <inheritdoc/>
         public Task StopAsync(CancellationToken cancellationToken)
         {
-            _lastRegistered = new List<PipelineName>();
+            _lastRegistered = [];
 
             return Task.CompletedTask;
         }

src/props/PackSite.Libraries.props

@@ -6,6 +6,7 @@
 	<Import Project="PackSite.Library.Crypto.props" Condition="Exists('PackSite.Library.Crypto.props')" />
 	<Import Project="PackSite.Library.DependencyInjection.props" Condition="Exists('PackSite.Library.DependencyInjection.props')" />
 	<Import Project="PackSite.Library.ETags.props" Condition="Exists('PackSite.Library.ETags.props')" />
+	<Import Project="PackSite.Library.Exceptions.props" Condition="Exists('PackSite.Library.Exceptions.props')" />
 	<Import Project="PackSite.Library.Extensions.props" Condition="Exists('PackSite.Library.Extensions.props')" />
 	<Import Project="PackSite.Library.Licensing.props" Condition="Exists('PackSite.Library.Licensing.props')" />
 	<Import Project="PackSite.Library.Logging.props" Condition="Exists('PackSite.Library.Logging.props')" />