services: Add support for nested links #1520

Job	Run time
Tests (3.8, pypi, redis, postgresql13, opensearch2)	3m 14s
Tests (3.8, pypi, redis, postgresql13, elasticsearch7)	3m 5s
Tests (3.8, pypi, redis, postgresql14, opensearch2)	3m 6s
Tests (3.8, pypi, redis, postgresql14, elasticsearch7)	3m 7s
Tests (3.8, pypi, redis, mysql8, opensearch2)	4m 34s
Tests (3.8, pypi, redis, mysql8, elasticsearch7)	4m 39s
Tests (3.9, pypi, redis, postgresql13, opensearch2)	3m 11s
Tests (3.9, pypi, redis, postgresql13, elasticsearch7)	3m 8s
Tests (3.9, pypi, redis, postgresql14, opensearch2)	3m 14s
Tests (3.9, pypi, redis, postgresql14, elasticsearch7)	4m 0s
Tests (3.9, pypi, redis, mysql8, opensearch2)	3m 37s
Tests (3.9, pypi, redis, mysql8, elasticsearch7)	3m 40s
	42m 35s

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