Action-testing: extend user actor with withdrawal txs

[protolambda]

Description

Withdrawals depend on the proposer working in action-testing. So this is now split from the main user-actor PR (#3628).

Depends on #3628

Tests

Work in progress. The test should be creating a withdrawal tx on L2, including it, then making a proposal on L1, including that, waiting the withdrawal period, and then completing the withdrawal.

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[mergify[bot]]

This PR changes implementation code, but doesn't include a changeset. Did you forget to add one?

[github-actions[bot]]

This PR is stale because it has been open 14 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[protolambda]

Will rebase this onto the proposer work so we can change it from draft to ready

[protolambda]

Rebased onto proposer-cleanup (#3805), we can now test withdrawals once the proposer actor makes its output root proposals.

[mergify[bot]]

Hey @protolambda! This PR has merge conflicts. Please fix them before continuing review.

[protolambda]

@trianglesphere updated, thanks

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This PR has been added to the merge queue, and will be merged soon.

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This PR is next in line to be merged, and will be merged as soon as checks pass.