Enable Azure Service Principal Certificate-Based authentication

[PauloGDPeixoto]

Describe the problem/challenge you have
At the moment, only Service Principals with client secret are able to authenticate, but recently, certificate-based authentication is being pushed as a more secure alternative.

Describe the solution you'd like
I'd like to be able to authenticate a Service Principal with a certificate.

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[ywk253100]

Link the official doc for certificate-based authentication: https://learn.microsoft.com/en-us/cli/azure/azure-cli-sp-tutorial-3

[ywk253100]

Reopen to track the work on the Azure plugin side

[ywk253100]

The issue can be closed once vmware-tanzu/velero-plugin-for-microsoft-azure#235 is merged