Please add sovereign cloud endpoints to Get-CloudServiceEndpoint.ps1

[GruberMarkus]

Is your request related to a problem? Please describe.
I want to prepare my software for use with the new sovereign clouds (Bleu, Delos, GovSG), but endpoints are not yet documented.

Describe The Request
Please add the endpoints for the new sovereign clouds (Bleu, Delos, GovSG) to https://github.com/microsoft/CSS-Exchange/blob/main/Shared/AzureFunctions/Get-CloudServiceEndpoint.ps1.

Additional context
MSAL.Net already added support for the new sovereign clouds (see PR AzureAD/microsoft-authentication-library-for-dotnet#5671).

[GruberMarkus]

Thanks, @dpaulson45!

Could you please also add GovSG, the Singapore sovereign cloud?

[dpaulson45]

Lukas was the one that worked on this. He did state that he was only able to add the 2 for a particular reason while investigating the other ones.