Update GetNamespaceInfo.ps1 to fix issue with private endpoints

[jboeshart]

I was still seeing issues when trying to resolve names with private endpoints that was part of Azure#169. I think this addresses issues in both, and was the only way I was able to properly resolve all of the names properly.

This checklist is used to make sure that common guidelines for a pull request are followed.

• I have read the contribution guidelines.
• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR.
• The pull request does not introduce breaking changes (unless a major version change occurs in the assembly and module).
• If applicable, the public code is properly documented.
• Pull request includes test coverage for the included changes.
• The code builds without any errors.

[jboeshart]

Looks like Microsoft has updated their original script where it now handles the private endpoint resolution properly. This is no longer needed.