Upgrade all manifests to v1 manifest format

manifests/c/Canonical/Ubuntu/16.04/Canonical.Ubuntu.yaml

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+PackageIdentifier: Canonical.Ubuntu
+Publisher: Canonical
+PackageName: Ubuntu
+Author: Canonical
+ShortDescription: Ubuntu on Windows allows you to use Ubuntu Terminal and run Ubuntu command line utilities including bash, ssh, git, apt and many more.
+Tags:
+- linux
+- ubuntu
+- distro
+- wsl
+PackageUrl: https://ubuntu.com/
+License: GPL
+LicenseUrl: https://ubuntu.com/licensing
+PackageVersion: 16.04
+InstallerType: appx
+Installers:
+- Architecture: x64
+  InstallerUrl: https://wsldownload.azureedge.net/Ubuntu_1604.2019.523.0_x64.appx
+  InstallerSha256: 55782021e04f52d071814fdad02cd37448c7a49f2ef5a66899f3d5bc7d79859f
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0

manifests/c/Canonical/Ubuntu/18.04/Canonical.Ubuntu.yaml

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+PackageIdentifier: Canonical.Ubuntu
+PackageVersion: 18.04
+PackageName: Ubuntu 18.04
+Publisher: Canonical
+License: Copyright Ubuntu
+LicenseUrl: https://ubuntu.com/licensing
+Moniker: ubuntu
+Tags:
+- linux
+- ubuntu
+- distro
+- wsl
+ShortDescription: Ubuntu on Windows allows you to use Ubuntu Terminal and run Ubuntu command line utilities including bash, ssh, git, apt and many more.
+PackageUrl: http://releases.ubuntu.com/18.04/
+Installers:
+- Architecture: x64
+  InstallerUrl: https://wsldownload.azureedge.net/CanonicalGroupLimited.Ubuntu18.04onWindows_1804.2018.817.0_x64__79rhkp1fndgsc.Appx
+  InstallerSha256: 96e4e3e336f08dde1df81fa9c266c5c7750ba92729857e92bde36bf84a1db002
+  SignatureSha256: f0557237e12a17984d6b54eb065d447892162671940aa5fdeead2b9d19a004e7
+  InstallerType: appx
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0

manifests/c/Canonical/Ubuntu/20.04/Canonical.Ubuntu.yaml

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+PackageIdentifier: Canonical.Ubuntu
+PackageVersion: 20.04
+PackageName: Ubuntu
+Publisher: Canonical
+License: Copyright Canonical Ltd
+LicenseUrl: https://ubuntu.com/licensing
+Moniker: ubuntu
+Tags:
+- linux
+- ubuntu
+- distro
+- wsl
+ShortDescription: Ubuntu on Windows allows you to use Ubuntu Terminal and run Ubuntu command line utilities including bash, ssh, git, apt and many more.
+PackageUrl: https://releases.ubuntu.com/20.04/
+Installers:
+- Architecture: x64
+  InstallerUrl: https://wsldownload.azureedge.net/Ubuntu_2004.2020.424.0_x64.appx
+  InstallerSha256: d40aa183993d110a93d386a547ee0165328082f0ef05e1da56c48a1a0e94e99a
+  SignatureSha256: 8b4690e1f1246d31c8e7b4e2c66a4c33f8cba4d6ccb76683826772d4c851da6a
+  InstallerType: appx
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0