ci: use agent image for unit tests task

[KauzClay]

the job gets it, but never used it. Might've been overlooked

changes already flown: https://ci.bosh-ecosystem.cf-app.com/teams/main/pipelines/bosh-agent-main/jobs/test-unit/builds/865

ai-assisted=yes
[TNZ-106038] Refactor bosh-agent CI pipeline to run integration tests on all supported stemcell lines (Jammy, Noble, Resolute)

[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 Plus

Run ID: 00de071f-375d-44ae-9fa3-d6872e0eca55

📥 Commits

Reviewing files that changed from the base of the PR and between 0918dcb and 475acd6.

📒 Files selected for processing (1)

• ci/pipeline.yml

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Walkthrough

The CI pipeline updates the test-unit task to run with bosh-agent-registry-image.

Suggested reviewers: selzoc, julian-hj

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the change and provides context, but it omits most required template sections, including tests, release notes, breaking changes, and team tags.	Complete the required sections with test results, operator-facing release notes, breaking-change status, team tags, and AI review feedback status.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main CI change: using the agent image for the unit-test task.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-task-images

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