Remove FSharpProjectDiagnosticAnalyzer (#42167)

src/Tools/ExternalAccess/FSharp/Diagnostics/IFSharpProjectDiagnosticAnalyzer.cs

-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-using System.Collections.Immutable;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace Microsoft.CodeAnalysis.ExternalAccess.FSharp.Diagnostics
-{
-    internal interface IFSharpProjectDiagnosticAnalyzer
-    {
-        Task<ImmutableArray<Diagnostic>> AnalyzeProjectAsync(Project project, CancellationToken cancellationToken);
-    }
-}

src/Tools/ExternalAccess/FSharp/Internal/Diagnostics/FSharpProjectDiagnosticAnalyzer.cs

-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-using System;
-using System.Collections.Immutable;
-using System.Composition;
-using System.Threading;
-using System.Threading.Tasks;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Microsoft.CodeAnalysis.ExternalAccess.FSharp.Diagnostics;
-using Microsoft.CodeAnalysis.Host;
-using Microsoft.CodeAnalysis.Host.Mef;
-
-namespace Microsoft.CodeAnalysis.ExternalAccess.FSharp.Internal.Diagnostics
-{
-    [Shared]
-    [ExportLanguageService(typeof(FSharpProjectDiagnosticAnalyzerService), LanguageNames.FSharp)]
-    internal class FSharpProjectDiagnosticAnalyzerService : ILanguageService
-    {
-        private readonly IFSharpProjectDiagnosticAnalyzer _analyzer;
-
-        [ImportingConstructor]
-        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
-        public FSharpProjectDiagnosticAnalyzerService(IFSharpProjectDiagnosticAnalyzer analyzer)
-        {
-            _analyzer = analyzer;
-        }
-
-        public Task<ImmutableArray<Diagnostic>> AnalyzeProjectAsync(Project project, CancellationToken cancellationToken)
-        {
-            return _analyzer.AnalyzeProjectAsync(project, cancellationToken);
-        }
-    }
-
-    [DiagnosticAnalyzer(LanguageNames.FSharp)]
-    internal class FSharpProjectDiagnosticAnalyzer : ProjectDiagnosticAnalyzer
-    {
-        private readonly ImmutableArray<DiagnosticDescriptor> _supportedDiagnostics;
-
-        public FSharpProjectDiagnosticAnalyzer()
-        {
-            _supportedDiagnostics = FSharpDocumentDiagnosticAnalyzer.CreateSupportedDiagnostics();
-        }
-
-        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => _supportedDiagnostics;
-
-        public override Task<ImmutableArray<Diagnostic>> AnalyzeProjectAsync(Project project, CancellationToken cancellationToken)
-        {
-            var analyzer = project.LanguageServices.GetService<FSharpProjectDiagnosticAnalyzerService>();
-            if (analyzer == null)
-            {
-                return Task.FromResult(ImmutableArray<Diagnostic>.Empty);
-            }
-
-            return analyzer.AnalyzeProjectAsync(project, cancellationToken);
-        }
-    }
-}