[BUGFIX beta] Migrate autorun microtask queue to Promise.then #17618
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The primary change in Backburner.js is to use the Promise microtask queue primarily and falling back to MutationObserver when Promise is not present. The test changes here are to migrate from `window.onerror` to `window.onunhandledrejection` hooks (due to moving the microtask delivery from `MutationObserver` to native `Promise`). The cross platform support for `onunhandledrejection` is a tad spotty (Chrome, Edge, and _soon_ Firefox), so I had to guard in other browsers.
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The primary change in backburner.js@2.5.0 is to use the Promise microtask queue primarily and falling back to MutationObserver when Promise is not present.
The test changes here are to migrate from
window.onerrortowindow.onunhandledrejectionhooks (due to moving the microtask delivery fromMutationObserverto nativePromise). The cross platform support foronunhandledrejectionis a tad spotty (Chrome, Edge, and soon Firefox), so I had to guard in other browsers.