leftovers some more automation

[ramonskie]

addition to #684

[coderabbitai]

Walkthrough

The pipeline adds reusable templates for relint environment updates, infrastructure destruction, and GCP DNS management. It replaces repeated inline task definitions across GCP deployment, failure, and smoke-test paths. Destruction tasks support ensure and on_failure hooks. DNS tasks support optional failure steps. The GCP acceptance test job now cleans up leftover environments on failure.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title indicates automation work but does not identify the specific reusable templates or pipeline changes.	Use a specific title, such as "Extract reusable Concourse automation tasks for GCP deployments".
Description check	❓ Inconclusive	The description only states that this change adds to issue #684 and does not explain the pipeline automation changes.	Add a brief summary of the reusable templates and the pipeline configurations they replace.

✅ Passed checks (3 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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch leftovers-func

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