Feature/3400 accordion accessibility

[amdomanska]

Make sure collapsible facets in the search page are accessible for screenreaders announcing the state of the accordion ("collapsed" and "expanded")

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important based on hotfix/3402_facets_accessibility_rerelease, should be released later

See #3400

aria-expanded needs to be added to the interactive element (i.e. button) rather than h3

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Code Style

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• ES queries are wrapped in a Query object rather than inlined in the code

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Testing

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Documentation

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• Core model documentation has been added to if needed: https://docs.google.com/spreadsheets/d/1lun2S9vwGbyfy3WjIjgXBm05D-3wWDZ4bp8xiIYfImM/edit

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• Events and consumers documentation has been added if needed: https://docs.google.com/spreadsheets/d/1oIeG5vg-blm2MZCE-7YhwulUlSz6TOUeY8jAftdP9JE/edit

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• Release sheet has been created, and completed as far as is possible https://docs.google.com/spreadsheets/d/1Bqx23J1MwXzjrmAygbqlU3YHxN1Wf7zkkRv14eTVLZQ/edit

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• There has been a recent merge up from hotfix/3402_facets_accessibility_rerelease . List the dates of the merges up from develop below

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Testing

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1. doajtest/testbook/public_site/public_search.yml

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