[Bicep] Automate FinOps resource deployment

📝 Scenario

As a FinOps practitioner, I need to automate Cost Management resource creation in order to streamline onboarding

💎 Solution

### Cost Management
- [x] #86
- [x] #184
- [x] #221
- [ ] Validate/publish the exports module (code is complete)
- [ ] #222
- [ ] #223
- [ ] Should we cover scheduled action deployment for MGs by deploying to each subscription?
- [ ] Should we cover tenant deployments for billing scopes?
- [ ] Should we re-evaluate tag inheritance setting in bicep? (We may still have the code)
- [ ] Do we need to migrate the 2 scheduled action BR modules to AVM?
- [ ] Update the docs to account for the switch to AVM (we reference BR explicitly)

### Other native products
- [ ] Are there any Azure Advisor resources that need coverage?
- [ ] Are there any Azure Carbon Optimization resources that need coverage?
- [ ] Are there any Azure Policy templates that we could consider offering curated templates for?

### FinOps toolkit
- [ ] Update or deprecate the FinOps hubs AVM
- [ ] Are there FinOps hubs capabilities that make sense as dedicated bicep modules (e.g., adding scopes, backfilling data)?
- [ ] Should we add FinOps workbooks to the bicep registry?

🙋‍♀️ Ask for the community

We could use your help:

1. Please vote this issue up (👍) to prioritize it.
2. Leave comments to help us solidify the vision.

Start by reviewing the unchecked Cost Management, Other native products, and FinOps toolkit task lists in this issue, including the questions about management-group and tenant deployments, AVM migration, and documentation. No files, tests, or entry points are named; the work is done only when the scope is decided and the selected resource coverage, module updates, and documentation changes are completed.