feat: Add support for configuring control-plane rbac on cosmos db accounts.

[OmnipotentOwl]

Issue-id

PR Checklist

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• [ ] I have added example(s) inside the [./examples/] folder
• [ ] I have added the example(s) to the integration test list for normal (~30 minutes) or long runner >30 minutes
• [x] I have checked the coding conventions as per the wiki
• [x] I have checked to ensure there aren't other open Pull Requests for the same update/change?

Description

Currently, it is impossible to assign management-level RBAC in Azure using the CAF module to a Cosmos DB account. This one-line change adds support for configuring Cosmos DB accounts with RBAC using the existing patterns and deployment mechanisms already validated in the module.

Does this introduce a breaking change

• [ ] YES
• [x] NO

Testing

Add a managed identity or other rbac assignment for a created cosmos db account and assign management level rbac to the cosmos db account.