Upgrade all manifests to v1 manifest format

manifests/m/Microsoft/WindowsTerminalPreview/1.4.2652.0/Microsoft.WindowsTerminalPreview.yaml

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+PackageIdentifier: Microsoft.WindowsTerminalPreview
+Publisher: Microsoft Corporation
+PackageName: Windows Terminal Preview
+Moniker: Terminal
+ShortDescription: Microsoft.WindowsTerminalPreview
+Description: Windows Terminal is a modern terminal application for users of command line tools and shells like Command Prompt, PowerShell, and Windows Subsystem for Linux (WSL). Its main features include multiple tabs, panes, Unicode and UTF-8 character support, a GPU accelerated text rendering engine, and the ability to create your own themes and customize text, colors, backgrounds, and shortcut key bindings.
+PackageUrl: https://github.com/microsoft/terminal
+Tags:
+- Console
+- Command-Line
+- Shell
+- Command Prompt
+- PowerShell
+- WSL
+- Developer Tools
+- Utilities
+License: MIT
+LicenseUrl: https://github.com/microsoft/terminal/blob/master/LICENSE
+PackageVersion: 1.4.2652.0
+MinimumOSVersion: 10.0.18362.0
+InstallerType: msix
+Installers:
+- Architecture: x64
+  InstallerUrl: https://github.com/microsoft/terminal/releases/download/v1.4.2652.0/Microsoft.WindowsTerminalPreview_1.4.2652.0_8wekyb3d8bbwe.msixbundle
+  InstallerSha256: 96ec7ba43e79dd5b77a88c1d782711450610ba8eef68a59a28e5ac9afc3f9b77
+  SignatureSha256: a708f72e661af7951fabd60602966c7c94bdc018aa644c15b752f1592a76a9be
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0