refactor: relax virtual clone requires #4396

Job	Run time
build (server, debug, true, true)	7m 47s
build (server, debug, true, true)	2m 42s
build (server, debug, true, false)	8m 6s
build (server, debug, true, false)	8m 6s
build (server, debug, false, true)	7m 56s
build (server, debug, false, true)	3m 17s
build (server, debug, false, false)	7m 56s
build (server, debug, false, false)	7m 56s
build (server, release, true, true)	7m 48s
build (server, release, true, true)	3m 25s
build (server, release, true, false)	8m 13s
build (server, release, true, false)	8m 13s
build (server, release, false, true)	8m 5s
build (server, release, false, true)	3m 19s
build (server, release, false, false)	7m 34s
build (server, release, false, false)	7m 34s
build (client, debug, true, true)	7m 9s
build (client, debug, true, true)	7m 9s
build (client, debug, true, false)	7m 31s
build (client, debug, true, false)	7m 31s
build (client, debug, false, true)	6m 44s
build (client, debug, false, true)	6m 44s
build (client, debug, false, false)	7m 8s
build (client, debug, false, false)	7m 8s
build (client, release, true, true)	8m 3s
build (client, release, true, true)	8m 3s
build (client, release, true, false)	7m 16s
build (client, release, true, false)	7m 16s
build (client, release, false, true)	7m 35s
build (client, release, false, true)	7m 35s
build (client, release, false, false)	7m 58s
build (client, release, false, false)	7m 58s
	3h 46m 45s

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