services: Add support for nested links #1525

Job	Run time
Tests (3.8, pypi, redis, postgresql13, opensearch2)	3m 22s
Tests (3.8, pypi, redis, postgresql13, elasticsearch7)	3m 41s
Tests (3.8, pypi, redis, postgresql14, opensearch2)	3m 36s
Tests (3.8, pypi, redis, postgresql14, elasticsearch7)	3m 8s
Tests (3.8, pypi, redis, mysql8, opensearch2)	3m 44s
Tests (3.8, pypi, redis, mysql8, elasticsearch7)	3m 55s
Tests (3.9, pypi, redis, postgresql13, opensearch2)	3m 48s
Tests (3.9, pypi, redis, postgresql13, elasticsearch7)	3m 34s
Tests (3.9, pypi, redis, postgresql14, opensearch2)	3m 19s
Tests (3.9, pypi, redis, postgresql14, elasticsearch7)	3m 37s
Tests (3.9, pypi, redis, mysql8, opensearch2)	3m 39s
Tests (3.9, pypi, redis, mysql8, elasticsearch7)	3m 58s
	43m 21s

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