[Staking] Fix: migrate_currency supports cases with leftover old staking locks #23549

Job	Run time
isdraft / isdraft	1s
check-fail-ci	9s
check-dependency-rules	7s
check-markdown	14s
check-readme	3m 19s
check-workspace	17s
preflight / preflight	5s
preflight / ci-versions	52s
fmt	1m 5s
check-rust-feature-propagation	1m 54s
test-rust-features	1m 49s
check-toml-format	1m 4s
check-umbrella	2m 0s
All quick checks passed	1s
	12m 57s

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