chore(shs-6055): add importers block to test dashboard #1489

Job	Run time
test_phpunit	1m 32s
set_sites	45s
lint_theme	36s
test_new_site	13m 12s
test_existing_site (artexhibitions)	5m 43s
test_existing_site (buddhiststudies)	6m 52s
test_existing_site (dsresearch)	5m 45s
test_existing_site (duboislab)	5m 44s
test_existing_site (gavin_wright__humsci)	5m 20s
test_existing_site (globalcurrents)	6m 2s
test_existing_site (grandtour)	5m 47s
test_existing_site (humanbiology)	7m 5s
test_existing_site (mcs)	6m 32s
test_existing_site (morrisoninstitute)	5m 26s
deploy_branch	1m 44s
	1h 18m 5s

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