Set of testing tweaks & min CLI increment

[digimaun]

• assign_role_assignment() will take a set of service principal KPIs into account. Useful when user principal names or service principal names are used for role assignment.
  • This operation will no longer return anything and works on a best-attempt basis.
  • Fixes an unhandled exception case if a role assignment already exists and output is still None.
• Raise minCLIVersion to 2.37.0 to have consistent MS graph experience.
• Refactors how an assertion works for ADU deployment creation, investigating change in existing model.
• Revert az dt rbac test pattern.

In-flight test run

https://dev.azure.com/azureiotdevxp/aziotcli/_build/results?buildId=7963&view=results

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