chore: Accumulated backports to v5-next#23994
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## Summary - Propagate `CheckpointProposalJob.interrupt()` to its `SequencerPublisher` so the publisher's `sendRequestsAt` slot-deadline sleep is cancelled on sequencer stop. - Check `interrupted` *before* sleeping in `sendRequestsAt`, since `InterruptibleSleep.interrupt()` only resolves sleeps already in flight. Completes #23930, which made the job's own polling waits interruptible but not the publisher's. In [this `e2e_ha_full.test.ts` flake](http://ci.aztec-labs.com/1c46f3d4a226073d) a node became proposer 165ms before teardown and took the no-broadcast votes path, leaving `pendingL1Submission = publisher.sendRequestsAt(targetSlot)` sleeping until the target slot — ~22 wall-clock minutes away under the warped test clock. `Sequencer.stop()` blocked on it ("Awaiting pending L1 payload submission"), node stops were abandoned, and Jest hung on leaked handles until CI killed the run. Nothing in the shutdown path interrupts the per-job `SequencerPublisher`: `publisherFactory.stopAll()` only interrupts the underlying `L1TxUtils`. ## Tests - `checkpoint_proposal_job.test.ts`: pending L1 submission blocked in the publisher resolves promptly on `job.interrupt()` (red without the fix). - `sequencer-publisher.test.ts`: `sendRequestsAt` returns immediately when interrupted before the sleep starts (red without the fix).
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fix: interrupt publisher send-at-slot sleep on sequencer stop (#23990)
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