[SMP] Update Quality Gate experiment

[GeorgeHahn]

What does this PR do?

Follow-up from #30687. Update the idle quality gate and add notes to the idle experiments. We plan to switch quality gate reports to the quality_gate prefixed experiments in the next week or two.

[GeorgeHahn]

• [SMP] Update Quality Gate experiment #30720 👈
• main

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[GeorgeHahn]

/merge

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[agent-platform-auto-pr]

[Fast Unit Tests Report]

On pipeline 48184516 (CI Visibility). The following jobs did not run any unit tests:

Jobs:

• tests_deb-arm64-py3
• tests_deb-x64-py3
• tests_flavor_dogstatsd_deb-x64
• tests_flavor_heroku_deb-x64
• tests_flavor_iot_deb-x64
• tests_rpm-arm64-py3
• tests_rpm-x64-py3
• tests_windows-x64

If you modified Go files and expected unit tests to run in these jobs, please double check the job logs. If you think tests should have been executed reach out to #agent-devx-help

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Regression Detector

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

The median merge time in main is 22m.

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