Remove TransferStake impl from Pools

[Ank4n]

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[Ank4n]

bot fmt

[command-bot]

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@Ank4n Command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh" has finished. Result: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7816431 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7816431/artifacts/download.

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/12058461405
Failed job name: check-runtime-migration

[Ank4n]

I merged this into #5501 since lot of changes in this PR did not make sense without the additional context of the other PR. Closing this.
cc: @Zebedeusz