`RuntimeGenesiConfig`: json macro added #12021

Job	Run time
preflight / preflight	44s
preflight / ci-versions	1m 8s
test-linux-stable-int	11m 0s
test-linux-stable-no-try-runtime (1/2)	36m 55s
test-linux-stable-runtime-benchmarks	36m 50s
test-linux-stable-no-try-runtime (2/2)	34m 4s
test-linux-stable (1/3, parity-large)	36m 23s
test-linux-stable (1/3, parity-oldlinux)	36m 6s
test-linux-stable (2/3, parity-large)	32m 15s
test-linux-stable (2/3, parity-oldlinux)	32m 12s
test-linux-stable (3/3, parity-large)	32m 12s
test-linux-stable (3/3, parity-oldlinux)	31m 52s
All tests passed	1s
	5h 21m 42s

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