AvoidUsingPositionalParameter: Check if command has parameters to avoid having az in default CommandAllowList

[bergmeister]

PR Summary

This is an enhancement to CommandAllowList introduced in #1846
To avoid having az as the default in it, return now the discovered command and inspect whether it has parameters. If not, which is the case for the az CLI, then do not continue analyzing usage of that command.
Also, az has backed out their change since then so with latest version of az, we don't need it as default allow-list anyway.

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[JamesWTruher]

@bergmeister should we have any validation for this new behavior? Not about removing "az", but rather the command having no parameters

[JamesWTruher]

just 1 question

[JamesWTruher]

this is fine