Change CommandInfo lookup for commands in the form module\cmdletName

[liamjpeters]

PR Summary

When the CommandInfoCache is used to lookup some fully qualified commands (by way of Get-Command), a nested module name is returned.

PR changes CommandInfoCache when a CommandInfo is looked up for a command in the form module\cmdletName. It passes this module name hint along to Get-Command to allow correct resolution.

With the MicrosoftTeams module installed, as an example, running:

Get-Command -Name 'MicrosoftTeams\Get-CsOnlineLisCivicAddress'

Reports the commands module as Microsoft.Teams.ConfigAPI.Cmdlets.

Instead running:

Get-Command -Name 'Get-CsOnlineLisCivicAddress' -Module 'MicrosoftTeams'

Correctly reports the module as MicrosoftTeams.

Also happens for Az.resources\Get-AzRoleEligibilitySchedule

Fixes #2123
Fixes #2023

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.