Flaky tests about lodestar HOT 5 OPEN

A lot of failed tests happen with useWorker=true, I think it has something to do with the fact that vitest also run in worker thread
for gossipsub, I suggest to only run on main thread mode for CI in #6368
we could do the same thing in req/resp tests too

I used to be able to stabalize e2e tests in "n-historical" state branch by only use useWorker=false

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A lot of failed tests happen with useWorker=true, I think it has something to do with the fact that vitest also run in worker thread

For this reason we already run e2e tests with forks not threads.

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Sometimes the sim tests still fail on unrelated changes:

• https://github.com/ChainSafe/lodestar/actions/runs/7688253188/job/20949254918?pr=6363
• https://github.com/ChainSafe/lodestar/actions/runs/7694591367/job/20980159851?pr=6369
• https://github.com/ChainSafe/lodestar/actions/runs/7690018577/job/20953270893?pr=6364

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Not directly a sim test error, but somewhat related: Error: Failed to CreateArtifact: Received non-retryable error: Failed request: (409) Conflict: an artifact with this name already exists on the workflow run

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Not directly a sim test error, but somewhat related: Error: Failed to CreateArtifact: Received non-retryable error: Failed request: (409) Conflict: an artifact with this name already exists on the workflow run

This happens since we merged #6410, the CI failed on that PR as well...

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