[Staking] Currency <> Fungible migration #15452

Job	Run time
preflight / preflight	43s
preflight / ci-versions	58s
test-linux-stable-int	11m 9s
test-linux-stable (1/3, parity-large)	48m 18s
test-linux-stable (1/3, parity-oldlinux)	47m 47s
test-linux-stable (2/3, parity-large)	37m 35s
test-linux-stable (2/3, parity-oldlinux)	37m 51s
test-linux-stable-runtime-benchmarks	39m 34s
test-linux-stable (3/3, parity-large)	37m 39s
test-linux-stable (3/3, parity-oldlinux)	32m 36s
test-linux-stable-no-try-runtime (1/2)	48m 40s
test-linux-stable-no-try-runtime (2/2)	38m 51s
All tests passed	1s
	6h 21m 42s

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