feat: add new lifecycle onAfterUnmount
#8762
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RFC: vuejs/rfcs#510
When we remove an element in JavaScript, the components contained within that element do not execute the
onUnmountedlifecycle. I added a new lifecycle calledonAfterUnmounted, which triggers after the component'selor the element containing the current component is removed from the DOM tree. Internally, I use aMutationObserverto listen for its removal.demo