Remove TransferStake impl from Pools #6657

Job	Run time
preflight / preflight	43s
preflight / ci-versions	1m 5s
cargo-check-benches (master)	4m 23s
cargo-check-benches (current)	4m 20s
cargo-check-each-crate (1)	5m 28s
cargo-check-all-crate-macos	7m 22s
test-frame-ui	5m 27s
cargo-check-each-crate (2)	5m 31s
cargo-check-each-crate (3)	5m 27s
test-full-crypto-feature	2m 34s
cargo-check-each-crate (4)	5m 25s
test-node-metrics	5m 29s
cargo-check-each-crate (5)	5m 25s
cargo-check-each-crate (6)	5m 26s
cargo-check-each-crate (7)	5m 26s
test-frame-examples-compile-to-wasm	2m 35s
node-bench-regression-guard	6s
test-deterministic-wasm	1s
check-tracing	1s
check-metadata-hash	1s
All test misc tests passed	1s
	1h 12m 16s

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