FOCUS 1.2-preview docs

[flanakin]

🛠️ Description

Update FOCUS docs for the FOCUS 1.2-preview release from Cost Management.

Relates to #1275

📋 Checklist

🙋‍♀️ 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)

[Copilot]

Pull Request Overview

This PR updates the FOCUS documentation for the new FOCUS 1.2‑preview release, revising guides, mappings, metadata, conformance summaries, and related scripts. Key updates include new versioning and mappings in documentation files, updated changelog entries, and modifications to the Build‑FocusConformance PowerShell script.

Reviewed Changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 1 comment.

File	Description
src/scripts/Build-FocusConformance.ps1	Adjusted script logic for locating the FOCUS spec directory and checking out tags.
docs-mslearn/toolkit/changelog.md	Updated changelog entry to reflect new FOCUS 1.2‑preview release details.
docs-mslearn/focus/what-is-focus.md	Updated dates and section content with enhanced formatting and emoji usage.
docs-mslearn/focus/validate.md & others	Revised various documentation files to align with the updated FOCUS 1.2‑preview specs.

Comments suppressed due to low confidence (1)

docs-mslearn/focus/what-is-focus.md:51

• [nitpick] The use of emojis enhances visual appeal, but please verify that they render consistently across all target environments to avoid misinterpretation in some documentation views.

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