Add back the IUnitTestingSolutionCrawlerServiceAccessor

src/Features/Core/Portable/ExternalAccess/UnitTesting/API/IUnitTestingSolutionCrawlerRegistrationServiceAccessor.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.Generic;
+using Microsoft.CodeAnalysis.Host;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.UnitTesting.Api
+{
+    internal interface IUnitTestingSolutionCrawlerServiceAccessor : IWorkspaceService
+    {
+        void Reanalyze(Workspace workspace, IEnumerable<ProjectId> projectIds = null, IEnumerable<DocumentId> documentIds = null, bool highPriority = false);
+
+        void AddAnalyzerProvider(IUnitTestingIncrementalAnalyzerProviderImplementation provider, UnitTestingIncrementalAnalyzerProviderMetadataWrapper metadata);
+    }
+}