Add Ubuntu 22.04 Dynamic Worker end-of-life docs (DRAFT)

[noviceexplorer]

Summary

• Adds a new EOL page for Ubuntu 22.04 Dynamic Workers, mirroring the structure of windows-2022-end-of-life.md (Add Windows 2022 Dynamic Worker end-of-life docs (DRAFT) #3210) and the existing ubuntu-1804-end-of-life.md.
• Covers the upgrade path from Ubuntu 22.04 → 24.04, with timeline (Jul–Oct 2026) and FAQ.
• Draft only — content pending review.

Notes for reviewers

• New page: src/pages/docs/infrastructure/workers/dynamic-worker-pools/ubuntu-2204-end-of-life.md
• No screenshots referenced — page is text + tables only.
• Timeline (14 Jul / 8 Sep / 13 Oct 2026) intentionally aligns with the Windows 2022 EOL PR (Add Windows 2022 Dynamic Worker end-of-life docs (DRAFT) #3210) so customers running both don't have two separate migration plans.
• FAQ links: Ubuntu 22.04/24.04 release notes (Canonical), .NET 7–10 breaking changes and release types (Microsoft).

Test plan

• Review wording, dates, and external links
• Build site locally and confirm page renders + nav order is correct
• Confirm no broken external links in the FAQ
• Cross-check timeline consistency with the Windows 2022 EOL PR (Add Windows 2022 Dynamic Worker end-of-life docs (DRAFT) #3210)

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