[AVM Module Issue]: support managed identity scaling with Azure DevOps agents

[Hi-Fi]

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Feature Request

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Description

Currently module expects always Personal Access Token to be used. With Azure DevOps also managed identities are supported, and would offer "secretless" creation of agents.

See microsoft/azure-container-apps#592

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[jaredfholgate]

This is something we want to implement. We went with PAT initially, as it is not dependent on Azure DevOps being in the same Entra ID tenant as ACA.