dot rendering improvements #2472

Job	Run time
tests (fdb-record-layer-lucene)	13m 49s
tests (fdb-record-layer-core)	19m 29s
other-tests	6m 53s
tests (fdb-extensions)	19m 47s
style	7m 11s
tests (yaml-tests)	16m 25s
coverage	0s
	1h 23m 34s

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