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Optimize connected components #6638

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Job	Run time
prepare-checks	1s
code-quality (stable)	1m 17s
documentation (stable)	2m 42s
linux-std-tests (stable)	12m 54s
linux-no-std-tests (stable)	3m 35s
linux-std-tests (prev)	12m 36s
linux-no-std-tests (prev)	3m 53s
macos-std-tests (stable)	5m 3s
windows-std-tests (stable)	9m 5s
	51m 6s