CI: update stemcell to match cf-deployment default

[aramprice]

No description provided.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0e8bc3c6-f793-4a26-ad46-7fa26747c912

📥 Commits

Reviewing files that changed from the base of the PR and between 64bb6fa and 5ec868f.

📒 Files selected for processing (1)

• ci/pipeline.yml

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Walkthrough

The pipeline configuration (ci/pipeline.yml) replaces the jammy-based warden stemcell with a noble-based stemcell. A new warden-stemcell resource (source name bosh-warden-boshlite-ubuntu-noble) was added, the warden-stemcell-jammy resource was removed, references in the brats-performance plan were switched from warden-stemcell-jammy to warden-stemcell, and the STEMCELL_OS parameter in brats-performance was changed from ubuntu-jammy to ubuntu-noble.

Suggested reviewers

• ramonskie
• a-hassanin

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	No pull request description was provided by the author, despite a detailed template being available that requires specific sections.	Add a comprehensive pull request description following the template, including: what/why the change, contextual information, tests run, release notes description, breaking change assessment, and team tagging.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: updating the stemcell to match cf-deployment's default, which is the primary objective of the pull request.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci-use-noble-for-cf-deployment-test

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[Copilot]

Pull request overview

Aligns the stemcell used by the BRATs performance CI job with the default stemcell used by cf-deployment, removing the now-unneeded Jammy warden stemcell resource from the pipeline.

Changes:

• Update brats-performance to use the warden-stemcell (Ubuntu Noble) resource for stemcell.
• Update STEMCELL_OS in brats-performance job params from ubuntu-jammy to ubuntu-noble.
• Remove the warden-stemcell-jammy resource definition from the Concourse pipeline.

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