CI: Switch to Standard_D2ds_v5 Azure vm type

[selzoc]

Standard_DS2_v2 is scheduled to be retired on 07/31/2026

ref https://learn.microsoft.com/en-us/azure/virtual-machines/sizes/lifecycle/retirement/d-ds-dv2-dsv2-ls-series-migration-guide

(already flown)

[coderabbitai]

Walkthrough

The Azure stemcell creation task now uses the Standard_D2ds_v5 VM size instead of Standard_DS2_v2.

Suggested reviewers: mkocher

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main CI change: switching the Azure VM size to Standard_D2ds_v5.
Description check	✅ Passed	The description is relevant and explains why the VM size change is needed due to Azure retirement.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch switch-to-non-retiring-vm-type

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