Refactor `WorkerThread` runloop; avoid pathological starvation of pollers #7668

Job	Run time
Submit Dependencies	0s
Test (ubuntu-latest, 3.3.4, temurin@8, ciJVM)	10m 11s
Test (ubuntu-latest, 3.3.4, temurin@8, ciNative)	15m 2s
Test (ubuntu-latest, 3.3.4, temurin@8, ciJS)	10m 13s
Test (ubuntu-latest, 3.3.4, temurin@17, ciJVM)	10m 10s
Test (ubuntu-latest, 2.12.20, temurin@8, ciJVM)	10m 25s
Test (ubuntu-latest, 2.12.20, temurin@8, ciNative)	10m 21s
Test (ubuntu-latest, 2.12.20, temurin@8, ciJS)	11m 13s
Test (ubuntu-latest, 2.13.15, temurin@8, ciJVM)	10m 18s
Test (ubuntu-latest, 2.13.15, temurin@8, ciNative)	10m 26s
Test (ubuntu-latest, 2.13.15, temurin@8, ciJS)	10m 25s
Test (ubuntu-latest, 2.13.15, temurin@8, ciFirefox)	6m 4s
Test (ubuntu-latest, 2.13.15, temurin@8, ciChrome)	5m 15s
Test (ubuntu-latest, 2.13.15, temurin@11, ciJVM)	10m 20s
Test (ubuntu-latest, 2.13.15, temurin@17, ciJVM)	10m 2s
Test (ubuntu-latest, 2.13.15, temurin@21, ciJVM)	10m 19s
Test (ubuntu-latest, 2.13.15, graalvm@21, ciJVM)	10m 24s
Test (windows-latest, 2.13.15, temurin@8, ciJVM)	11m 4s
Test (windows-latest, 2.13.15, temurin@11, ciJVM)	11m 23s
Test (windows-latest, 2.13.15, temurin@17, ciJVM)	11m 20s
Test (windows-latest, 2.13.15, temurin@21, ciJVM)	11m 21s
Test (windows-latest, 2.13.15, graalvm@21, ciJVM)	11m 11s
Test (macos-14, 2.13.15, temurin@11, ciJVM)	11m 18s
Test (macos-14, 2.13.15, temurin@17, ciJVM)	12m 8s
Test (macos-14, 2.13.15, temurin@21, ciJVM)	11m 24s
Test (macos-14, 2.13.15, graalvm@21, ciJVM)	11m 25s
Publish Artifacts	0s
	4h 23m 42s

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