Implements data.europa.eu support #552

Job	Run time
test-api (3.8)	23s
test-repositories-plus (3.8)	29s
test-api (3.12)	25s
test-repositories (zenodo, 3.8)	40s
test-repositories-plus (3.12)	32s
test-repositories (zenodo, 3.12)	42s
test-repositories (dataverse, 3.8)	30s
test-repositories (dataverse, 3.12)	29s
test-repositories (figshare, 3.8)	19s
test-repositories (figshare, 3.12)	22s
test-repositories (djehuty, 3.8)	16s
test-repositories (djehuty, 3.12)	18s
test-repositories (dryad, 3.8)	16s
test-repositories (dryad, 3.12)	22s
test-repositories (osf, 3.8)	2m 17s
test-repositories (osf, 3.12)	3m 9s
test-repositories (mendeley, 3.8)	20s
test-repositories (mendeley, 3.12)	30s
test-repositories (dataone, 3.8)	1m 44s
test-repositories (dataone, 3.12)	1m 44s
test-repositories (dspace, 3.8)	21s
test-repositories (dspace, 3.12)	17s
test-repositories (pangaea, 3.8)	27s
test-repositories (pangaea, 3.12)	21s
test-repositories (github, 3.8)	13s
test-repositories (github, 3.12)	14s
	17m 40s

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