linux/cpu: add idle/io_wait/nice/system/user percentages - #1627

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⚠️ Only [ghcr.io/cirruslabs/macos-runner:sonoma, ghcr.io/cirruslabs/macos-runner:sequoia, ghcr.io/cirruslabs/macos-runner:tahoe] is allowed. Automatically upgraded to ghcr.io/cirruslabs/macos-runner:tahoe.

✅ 00:01 clone
✅ 00:20 setup
✅ 00:40 test