Adding Microsoft.PowerShell.Commands.Diagnostics to the list of packages published to our MyGet feed (PowerShell#3050)

Author: mirichmo

build.psm1

@@ -1680,6 +1680,7 @@ function Publish-NuGetFeed
     @(
 'Microsoft.PowerShell.Commands.Management',
 'Microsoft.PowerShell.Commands.Utility',
+'Microsoft.PowerShell.Commands.Diagnostics',
 'Microsoft.PowerShell.ConsoleHost',
 'Microsoft.PowerShell.Security',
 'System.Management.Automation',