feat(shs-5963): add accordion toggle all in previews #1119

Job	Run time
lint_theme	36s
test_phpunit	1m 3s
set_sites	37s
test_new_site	18s
test_existing_site (aaai)	18s
test_existing_site (ccsre)	13s
test_existing_site (dennylab)	17s
test_existing_site (english)	18s
test_existing_site (iriss)	19s
test_existing_site (middleeast)	17s
test_existing_site (oconnell)	17s
test_existing_site (researchadmin_humsci)	16s
test_existing_site (texttechnologies)	1s
test_existing_site (west)	1s
deploy_branch	1s
	4m 52s

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