Merged PR 13782: Remove Package Certificate File from csproj

Windows/samples/GraphNotificationsSample/GraphNotificationsSample.csproj

@@ -22,7 +22,6 @@
     <AppxBundle>Always</AppxBundle>
     <AppxBundlePlatforms>x64</AppxBundlePlatforms>
     <PackageCertificateThumbprint>3FD265E4FC786A7A28192B070A81132FF51AA0CE</PackageCertificateThumbprint>
-    <PackageCertificateKeyFile>GraphNotificationsSample_TemporaryKey.pfx</PackageCertificateKeyFile>
     <AppInstallerUpdateFrequency>1</AppInstallerUpdateFrequency>
     <AppInstallerCheckForUpdateFrequency>OnApplicationRun</AppInstallerCheckForUpdateFrequency>
     <AppxSymbolPackageEnabled>False</AppxSymbolPackageEnabled>