Break out bicep modules for hubs extensibility

[flanakin]

🛠️ Description

This PR reorganizes FinOps hubs bicep into a cleaner, more extensible structure while fixing build issues and improving maintainability.

• Moved all JSON schemas into relevant module directories
• Split large monolithic files (e.g., 5K+ line dataFactory.bicep) into smaller modules
• Moved all framework modules into the fx folder
• Organized apps into X.Y/Z folders for each publisher/app:
  • Microsoft.CostManagement/Exports – Cost export functionality
  • Microsoft.CostManagement/ManagedExports – Managed exports
  • Microsoft.FinOpsHubs/Analytics – Data Explorer and analytics
  • Microsoft.FinOpsHubs/Core – Core hub infrastructure
  • Microsoft.FinOpsHubs/RemoteHub – Remote hub functionality
• Resolved all Bicep compilation errors/warnings
• Added #disable-next-line BCP318 with explanations for null safety
• Fixed Build-Toolkit.ps1 param generation bug
• Updated PowerShell build scripts with correct paths

📋 Checklist

🔬 How did you test this change?

• 🤏 Lint tests
• 🤞 PS -WhatIf / az validate
• 👍 Manually deployed + verified
• 💪 Unit tests
• 🙌 Integration tests

🙋‍♀️ Do any of the following that apply?

• 🚨 This is a breaking change.
• 🤏 The change is less than 20 lines of code.

📑 Did you update docs/changelog.md?

• ✅ Updated changelog (required for dev PRs)
• ➡️ Will add log in a future PR (feature branch PRs only)
• ❎ Log not needed (small/internal change)

📖 Did you update documentation?

• ✅ Public docs in docs (required for dev)
• ✅ Internal dev docs in src (required for dev)
• ➡️ Will add docs in a future PR (feature branch PRs only)
• ❎ Docs not needed (small/internal change)

[RolandKrummenacher]

I'm getting an error while deploying from your branch, since I'm using a hub name that is a bit longer:

I'm trying to update an existing deployment.

[flanakin]

@RolandKrummenacher Sorry for the delay. I fixed this.

[RolandKrummenacher]

@RolandKrummenacher Sorry for the delay. I fixed this.

Works now. Thanks.

[MSBrett]

Getting a bunch of timing related failures.

[MSBrett]

✅ LGTM - Tested and validated

Deployments tested successfully:

• ✅ Public networking (eastus2)
• ✅ Private networking (eastus2)
• ✅ Long hub names with ADX truncation
• ✅ Multiple subscriptions

Changes validated:

• ✅ Modular bicep organization works
• ✅ ADX cluster name validation fixed (@maxlength(22))
• ✅ Private endpoints correctly configured
• ✅ Resource creation and networking successful

Note for future optimization:
Multiple StopTriggers deployment scripts (one per module) run sequentially with private endpoints, adding ~1 min overhead per script. Consider consolidating into a single script in a future PR for efficiency.

Commits added:

• b4b1b13: Fix ADX cluster name length validation

[flanakin]

@microsoft-github-policy-service agree [company="Xerilium"]

[flanakin]

@microsoft-github-policy-service agree company="Xerilium"