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

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[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).

[Copilot]

x_RecommendationId is only lowercased when it is null/empty (because the tolower is applied to the ResourceId fallback). If x_RecommendationId is populated with mixed casing, this change won’t normalize it, which defeats the stated goal of consistent casing for joins/comparisons. Consider lowercasing x_RecommendationId itself (and then applying any fallback logic after normalization, if still needed).

Suggested change

	x_RecommendationId = coalesce(x_RecommendationId, tolower(ResourceId)), // Force lowercase for consistent grouping/filtering
	x_RecommendationId = tolower(coalesce(x_RecommendationId, ResourceId)), // Force lowercase for consistent grouping/filtering

[Copilot]

This PR is described as a casing-only normalization, but x_RecommendationId now also changes behavior by filling missing values from ResourceId via coalesce(...). If that fallback is intentional, the PR description should mention the semantic change (and why it’s safe); otherwise, consider keeping the existing null behavior and only normalize casing.

[Copilot]

If this change is intended to be promoted/merged into dev, the repo’s documented process requires customer-facing changes to be reflected in the changelog (and applicable docs) before promotion (see docs-wiki/Release-process.md and docs-wiki/Branching-strategy.md). Please add the corresponding entry in docs-mslearn/toolkit/changelog.md as part of this PR (or before merging to dev).