Reduce concurrent integration tests

[selzoc]

Mirroring this bosh pr: cloudfoundry/bosh#2759 since they share the same wiring for integration tests

(already flown)

[coderabbitai]

Walkthrough

The bosh-integration-tests job’s tests task now sets PARALLEL_TEST_MULTIPLY_PROCESSES to "0.6" in its parameters. No other job logic or inputs/outputs are changed.

Suggested reviewers: julian-hj, alphasite

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is too sparse and misses most required template sections, including tests, release notes, breaking change, tags, and AI review feedback.	Expand the PR description to fill each template section, especially why it's needed, tests run, release note text, breaking-change impact, and AI review status.

✅ Passed checks (4 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 matches the change: reducing concurrency for integration tests.

✨ 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 reduce-concurrent-integration-tests

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