services: Add support for nested links #1486

Job	Run time
Tests (3.8, pypi, redis, postgresql13, opensearch2)	3m 19s
Tests (3.8, pypi, redis, postgresql13, elasticsearch7)	3m 14s
Tests (3.8, pypi, redis, postgresql14, opensearch2)	3m 27s
Tests (3.8, pypi, redis, postgresql14, elasticsearch7)	3m 8s
Tests (3.8, pypi, redis, mysql8, opensearch2)	3m 26s
Tests (3.8, pypi, redis, mysql8, elasticsearch7)	3m 27s
Tests (3.9, pypi, redis, postgresql13, opensearch2)	3m 25s
Tests (3.9, pypi, redis, postgresql13, elasticsearch7)	3m 19s
Tests (3.9, pypi, redis, postgresql14, opensearch2)	3m 14s
Tests (3.9, pypi, redis, postgresql14, elasticsearch7)	3m 12s
Tests (3.9, pypi, redis, mysql8, opensearch2)	3m 35s
Tests (3.9, pypi, redis, mysql8, elasticsearch7)	3m 38s
	40m 24s

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