WithReference to an Azure Foundry project resource doesn't assign the right roles

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

Attempting to give a Node app permissions on. Foundry project, accessed through AIProjectClient, the correct role to permit this per [documentation]( https://learn.microsoft.com/en-us/azure/foundry/concepts/authentication-authorization-foundry) is Azure AI User. I want to invoke existing agents and not create or modify anything within the project, so this is sufficient and I've proved this. When I assign this myself manually, project works, when I don't, it doesn't. The available roles in withRoleAssignment are different to this and seem to be legacy. I tried overriding to assign the right role but in Typescript, the FoundryRole enum doesn't include the role I require and I didn't find a way to break out of this resource-specific extension method and get 'normal' behaviour which I would expect to allow me to assign any role.

#15971 is similar but not the same

### Expected Behavior

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### Steps To Reproduce

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### Exceptions (if any)

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### Aspire doctor output

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### Anything else?

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