[Staking] Currency <> Fungible migration #15786

Job	Run time
preflight / preflight	39s
preflight / ci-versions	1m 0s
test-linux-stable-int	9m 51s
test-linux-stable-runtime-benchmarks	32m 57s
test-linux-stable (1/3, parity-large)	41m 0s
test-linux-stable (1/3, parity-oldlinux)	40m 12s
test-linux-stable-no-try-runtime (1/2)	42m 33s
test-linux-stable (2/3, parity-large)	22m 53s
test-linux-stable (2/3, parity-oldlinux)	31m 39s
test-linux-stable-no-try-runtime (2/2)	33m 12s
test-linux-stable (3/3, parity-large)	22m 58s
test-linux-stable (3/3, parity-oldlinux)	27m 2s
All tests passed	1s
	5h 5m 57s

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