chore(coprocessor): improve host-listener tests performance

[PanGan21]

Summary

• Reduce NB_EVENTS_PER_WALLET from 200 to 50 in restart/reorg tests — total events are sufficient to test catchup, restart, and reorgs
• Replace hardcoded sleep waits with poll-based approach that exit as soon as the expected condition is met
• Reduce slow-lane test block time from 3.0s to 1.0s and replace sleeps with Anvil block number polling

Performance

• main branch: 14m 45s
• current branch: 7m 42s

Ref: https://github.com/zama-ai/fhevm-internal/issues/1155

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Merge Queue Status

• ✅ Entered queue — 2026-03-16 09:52 UTC · Rule: main
• ✅ Checks passed · on draft merge queue: embarking main (cc70478), #2101 and #2113 together #2117
• ✅ Merged — 2026-03-16 12:39 UTC · at ab2d23b2dbdd50f35eeae229bdd62349e37d47a8

This pull request spent 2 hours 47 minutes 42 seconds in the queue, including 1 hour 46 minutes 21 seconds running CI.

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