Update FinOps Hub deployment ADF Role Assignment from UAA to RBAC Admin

[ankurshukla03]

⚠️ Problem

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Currently during the deployment of the finops hub the ADF managed identity tries to assign UAA role on the hub storage account. UAA has more action roles than RBAC Admin.

🛠️ Solution

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There is a new role in Azure platform that can be used instead of UAA is RBAC Admin. Please update the role assignment that ADF MI tries to assign on the hub storage account to be RBAC Adminstrator instead of UAA.

ℹ️ Additional context

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[flanakin]

@MSBrett FYI