PSAvoidUsingPositionalParameters: Do not warn on AZ CLI

[bergmeister]

PR Summary

Fixes #1845
AZ CLI entrypoint recently changed from a batch file to an az.ps1 'script' in latest version 2.40.0, which just passed $args arguments as-is to python so it is still a CLI and not a script with parameters.

PR Checklist

• PR has a meaningful title
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• 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
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[bergmeister]

After an internal review we decided that we should not have it in code but as configuration but can still exclude az by default.

[JamesWTruher]

this looks really good