Antithesis Vector end-to-end ack scenario

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Summary

This PR introduces a new antithesis scenario confirming that without disk buffers a single Vector instance is capable of maintaining conservation and liveness when e2e acks are enabled. This is a simplification of vector_to_vector_e2e_disk and is intended to demonstrate that e2e acks behave as expected.

Vector configuration

How did you test this PR?

Change Type

• Bug fix
• New feature
• Dependencies
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

Notes

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  • Alternatively, we recommend running the following locally before pushing to the remote branch:
    • make fmt
    • make check-clippy (if there are failures it's possible some of them can be fixed with make clippy-fix)
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Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• disk buffers v2 reopen buffer after restart crash loop #25570
• Antithesis Vector end-to-end ack scenario #25571 👈 (View in Graphite)
• chore(tests): antithesis harness, durability harness scenario #25562 : 1 other dependent PR (#25525 )
• master

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