Remove unused files (#19707)

Author: MiYanni

Microsoft.DotNet.Cli.sln

@@ -15,8 +15,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "core-sdk-tasks", "src\core-
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.DotNet.Tools.Tests.Utilities", "test\Microsoft.DotNet.Tools.Tests.Utilities\Microsoft.DotNet.Tools.Tests.Utilities.csproj", "{78E15EC1-7732-41E3-8591-934E9F583254}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Dotnet.Sdk.Internal", "src\Microsoft.Dotnet.Sdk.Internal\Microsoft.Dotnet.Sdk.Internal.csproj", "{73F07908-981B-41BB-B9BD-F3420274A6F7}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SdkTests", "test\SdkTests\SdkTests.csproj", "{CB1EE94E-CB83-4071-9DD0-9929AE2B7282}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "core-sdk-tasks.Tests", "test\core-sdk-tasks.Tests\core-sdk-tasks.Tests.csproj", "{658EF9BE-452C-4D31-AA24-B9E2235799A8}"
@@ -43,10 +41,6 @@ Global
 		{78E15EC1-7732-41E3-8591-934E9F583254}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{78E15EC1-7732-41E3-8591-934E9F583254}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{78E15EC1-7732-41E3-8591-934E9F583254}.Release|Any CPU.Build.0 = Release|Any CPU
-		{73F07908-981B-41BB-B9BD-F3420274A6F7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{73F07908-981B-41BB-B9BD-F3420274A6F7}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{73F07908-981B-41BB-B9BD-F3420274A6F7}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{73F07908-981B-41BB-B9BD-F3420274A6F7}.Release|Any CPU.Build.0 = Release|Any CPU
 		{CB1EE94E-CB83-4071-9DD0-9929AE2B7282}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{CB1EE94E-CB83-4071-9DD0-9929AE2B7282}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{CB1EE94E-CB83-4071-9DD0-9929AE2B7282}.Release|Any CPU.ActiveCfg = Release|Any CPU