Removed duplicate manifest for Visual Studio 2019 BuildTools version 16.6.30128.74. (#13133)

manifests/m/Microsoft/VisualStudio/BuildTools/16.6.30128.74/Microsoft.VisualStudio.BuildTools.yaml

@@ -1,26 +0,0 @@
-PackageIdentifier: Microsoft.VisualStudio.BuildTools
-PackageVersion: 16.6.30128.74
-PackageName: Visual Studio Build Tools
-Publisher: Microsoft
-License: Copyright (c) Microsoft Corporation. All rights reserved.
-LicenseUrl: https://visualstudio.microsoft.com/license-terms/
-Tags:
-- C++
-- tools
-- C#
-- build
-- vs
-ShortDescription: Visual Studio Build Tools
-PackageUrl: https://visualstudio.microsoft.com/
-Installers:
-- Architecture: x64
-  InstallerUrl: https://download.visualstudio.microsoft.com/download/pr/17a0244e-301e-4801-a919-f630bc21177d/9821a63671d5768de1920147a2637f0e079c3b1804266c1383f61bb95e2cc18b/vs_BuildTools.exe
-  InstallerSha256: 9821A63671D5768DE1920147A2637F0E079C3B1804266C1383F61BB95E2CC18B
-  InstallerType: exe
-  InstallerSwitches:
-    Silent: --quiet
-    SilentWithProgress: --passive
-    Custom: --productId Microsoft.VisualStudio.Product.BuildTools --channelId VisualStudio.16.Release --channelUri https://aka.ms/vs/16/release/channel
-PackageLocale: en-US
-ManifestType: singleton
-ManifestVersion: 1.0.0