feat(power-bi): add subscription to unattached disks report

[UJJWAL RAJ (iUjjwalRaj)]

🛠️ Description

• Added the Subscription column (Subscriptions.name) to the "Compute disks" table visual on the "Unattached disks" page.
• Applied the exact same visual definition updates to both KQL (src/power-bi/kql/WorkloadOptimization.Report/report.json) and Storage (src/power-bi/storage/WorkloadOptimization.Report/report.json) Workload Optimization reports.
• Added the required changelog entry in docs-mslearn/toolkit/changelog.md under the active unreleased section.

Local Validation

• Local Python JSON parsing and structural assertions passed (verified valid JSON syntax, single Subscriptions From source, single Subscriptions.name Select property and projection positioned immediately after Disks (2).resourceGroup, displayName "Subscription", and 100% parity across KQL and Storage report definitions).
• git diff --check passed cleanly with no whitespace or formatting errors.
• Pester unit/lint test suite could not be run locally because PowerShell (pwsh) is not installed in this macOS environment.

Fixes #2201

📷 Screenshots

Not applicable (Power BI report schema updated directly in report.json).

📋 Checklist

🔬 How did you test this change?

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

📦 Deploy to test?

• Hubs + ADX (managed)
• Hubs + Fabric (manual) — URI:
• Hubs (manual)
• Hubs (no data)
• Workbooks
• Alerts

🙋‍♀️ 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)

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[UJJWAL RAJ (iUjjwalRaj)]

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