[Bicep Registry] Budgets bicep module for RBAC scopes

[flanakin]

📝 Scenario

As a FinOps practitioner, I need to deploy budgets as part of my templates in order to automate onboarding for new projects

💎 Solution

Publish budget modules to the Bicep Registry for each supported scope.

ℹ️ Additional context

Bicep requires separate files per deployment scope. Since this would require excessive duplication of code, we'll use the FinOps toolkit bicep templating language to support multiple scopes.

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