Document correct backfill order and MCA billing profile requirements for FinOps Hubs

[Copilot]

This PR addresses critical documentation gaps that were causing users to experience missing Reserved Instance (RI) savings in Data Explorer reports when backfilling historical data.

Problem

Users migrating from Storage to Data Explorer versions of FinOps Hubs encountered:

• Missing RI savings calculations in historical Data Explorer reports (only showing in current month)
• Confusion about MCA billing profile vs billing account scope requirements for certain exports
• No clear guidance on correct backfill order or how to fix incorrect backfills

Root Cause

The issue occurred when users backfilled cost data before price data, causing the Data Explorer ingestion process to miss price information needed for accurate savings calculations.

Solution

Enhanced documentation with:

📋 Clear Backfill Order Requirements

• Prominent warnings explaining why order matters for RI/savings plan calculations
• Step-by-step guidance for both Azure portal and PowerShell approaches
• Specific examples showing correct export sequence

🔧 MCA Billing Profile Requirements

• Explicit documentation that price sheet, reservation recommendations, and reservation details exports must use billing profile scope for MCA contracts
• Clear explanation that this is a Cost Management limitation, not a FinOps Hubs requirement

🚨 Troubleshooting Guidance

• Detailed recovery steps for users who already backfilled in wrong order
• Pipeline re-run instructions to reprocess cost data after price data becomes available
• Verification steps to confirm the fix worked

Files Changed

• docs-mslearn/toolkit/hubs/deploy.md: Enhanced backfill section, added troubleshooting, improved PowerShell examples
• docs-mslearn/toolkit/hubs/configure-scopes.md: Added MCA billing profile requirements with warning callouts
• docs-mslearn/toolkit/hubs/data-processing.md: Fixed typo in price processing description

Impact

• ✅ Prevents missing RI savings in Data Explorer reports for new deployments
• ✅ Provides clear recovery path for users who already have the issue
• ✅ Eliminates confusion about MCA export scope requirements
• ✅ Improves overall user experience with clearer step-by-step guidance

Fixes #1729.

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