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ci: fix flaky Kafka E2E tests (event wait polling + docker pull retry)

Two remaining flakiness sources in the E2E workflow:

- The 'emit event' scenario asserted after a fixed 1s delay, which is
  too tight for a double Kafka round-trip on loaded CI runners. Replace
  it with polling (up to 10s) plus a short grace period to still catch
  duplicated deliveries.
- Docker Hub image pulls occasionally time out on GitHub runners,
  failing jobs before tests even start. Retry the pull up to 3 times
  before starting the containers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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