Pester - Change MyGet feed dependencies

[LaurentDardenne]

Impacts: slowness during the execution of tests using a MyGet feed.

Feeds out of service, no SLA : see https://www.reddit.com/r/dotnet/comments/159yigd/is_myget_gone_for_good/

https://github.com/MyGet/MyGetDocs/issues/ 143

Github Action error :

[LaurentDardenne]

Now we use cloudsmith for the test repository. The choice of a local repository (share) for the tests is abandoned.

The nuget feeds used in the tests remain active.

Note : See this if migrating to 'Microsoft.PowerShell.PSResourceGet'

[LaurentDardenne]

The test repository.