fix: handle detached nodes for accessible descriptions

[jlp-craigmorten]

Fixes #1026

Updates the computeAccessibleDescription() method to handle computation of an accessible description for an element that has not been added to the document.

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In this fix I have opted to use the querySelector() approach, using a polyfill of CSS.escape() to handle special characters in the element's id (e.g. see React.useId()). There may be other valid approaches that are less involved and more performant.

The fix is applied to the queryIdRefs() utility, and so also impacts other usage such as aria-owns and aria-labelledby evaluation.

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