Force common filters and group bys to be lowercase

[flanakin]

🛠️ Description

Force common filter and group-by columns to lowercase in the IngestionSetup KQL script to ensure consistent casing for joins and comparisons across datasets.

Fixes # N/A

📋 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)
• ✅ Public docs in docs-mslearn (required for dev)
• ✅ Internal dev docs in docs-wiki (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)

[Copilot]

Pull request overview

Updates the FinOps hubs ADX ingestion setup (FOCUS 1.2) to normalize casing for key recommendation columns so joins and comparisons behave consistently across datasets.

Changes:

• Lowercase ResourceId and ResourceName in Recommendations_transform_v1_2().
• Lowercase x_ResourceGroupName in Recommendations_transform_v1_2().
• Update x_RecommendationId projection (now uses coalesce(...) with a ResourceId-based fallback).

[flanakin]

🤖 [AI][Claude] PR Update Summary

Addressed: 3 thread(s)

• ✅ Implemented: 2
• 💬 Not applicable: 1

Changes: Removed unintended coalesce(x_RecommendationId, ResourceId) fallback, applied tolower() directly to x_RecommendationId, and restored the original TODO comment. Changelog thread noted as not applicable since this PR targets a feature branch.