ci: consolidate platform pipelines and test prerequisites on macOS support

MeetingAssistant.Tests/AsrDiagnosticEndpointTests.cs

@@ -34,7 +34,7 @@ public sealed class AsrDiagnosticEndpointTests
     public async Task NamedProfileEndpointPassesProfileToConfiguredProvider()
     {
         var pipelineFactory = new CapturingProfileSpeechRecognitionPipelineFactory();
-        await using var factory = new WebApplicationFactory<Program>()
+        await using var factory = new IsolatedApplicationFactory()
             .WithWebHostBuilder(builder =>
             {
                 builder.ConfigureAppConfiguration((_, configuration) =>
@@ -104,7 +104,7 @@ public sealed class AsrDiagnosticEndpointTests
     public async Task SpeakerIdentityMergeDiagnosticEndpointUsesRecentDaysParameter()
     {
         var mergeService = new CapturingSpeakerIdentityMergeService();
-        await using var factory = new WebApplicationFactory<Program>()
+        await using var factory = new IsolatedApplicationFactory()
             .WithWebHostBuilder(builder =>
             {
                 builder.ConfigureAppConfiguration((_, configuration) =>
@@ -140,7 +140,7 @@ public sealed class AsrDiagnosticEndpointTests
         Func<string, IReadOnlyList<TranscriptionSegment>, SpeechRecognitionPipelineOptions, CancellationToken, Task<IReadOnlyList<TranscriptionSegment>>> finalize)
         where TProvider : class, IStreamingTranscriptionProvider
     {
-        return new WebApplicationFactory<Program>()
+        return new IsolatedApplicationFactory()
             .WithWebHostBuilder(builder =>
             {
                 builder.ConfigureAppConfiguration((_, configuration) =>
@@ -267,4 +267,3 @@ public sealed class AsrDiagnosticEndpointTests
         }
     }
 }
-