`RuntimeGenesiConfig`: json macro added #11940

Job	Run time
preflight / preflight	47s
preflight / ci-versions	1m 2s
test-linux-stable-no-try-runtime (1/2)	37m 21s
test-linux-stable-runtime-benchmarks	36m 22s
test-linux-stable-no-try-runtime (2/2)	34m 17s
test-linux-stable-int	10m 42s
test-linux-stable (1/3, parity-large)	36m 34s
test-linux-stable (1/3, parity-oldlinux)	37m 12s
test-linux-stable (2/3, parity-large)	32m 14s
test-linux-stable (2/3, parity-oldlinux)	26m 52s
test-linux-stable (3/3, parity-large)	32m 36s
test-linux-stable (3/3, parity-oldlinux)	15m 34s
All tests passed	1s
	5h 1m 34s

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