refactor(accordion, accordion-item): getElementProp on child is factored out and parent gets a mutation observer to update children#6055

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elijbet/6038-accordion-item-refactor-getElementProp-and-get-mutation-observer-on-parentEsri/calcite-design-system:elijbet/6038-accordion-item-refactor-getElementProp-and-get-mutation-observer-on-parentCopy head branch name to clipboard