Add support for Azure Managed Identity Storage Account authentication in CCES deployments

[joeharlan]

Is your feature request related to a problem? Please describe.

Customers deploying new Rubrik clusters in Azure are seeking to take advantage of some recent security enhancements. The latest enhancement for CCES in Azure is Managed Identities for Storage Account/Blob Container access rather than using Account Key access; this approach is also now considered the best path forward.

The current provider code does not appear to accommodate Managed Identity use for Storage Account access.

Describe the solution you'd like

Implement the necessary options to specify use of Managed Identity authentication as opposed to Account Keys.

Describe alternatives you've considered

Customer would need to convert to the MI method using the RSC UI workflow.

Additional context

N/A