Migrate integration tests to use `history` instead of `timeline`

[jpwilliams]

Summary

Moves integration tests to use the history field instead of the legacy timeline field which was removed in inngest/inngest#847.

Checklist

• [ ] Added a docs PR that references this PR N/A Internal change
• [x] Added unit/integration tests
• [ ] Added changesets if applicable N/A Internal change

Related

• Needed after inngest/inngest#847
• Needed to merge #368

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 1002a7a95355291cf0417e9257e6e84693bd1a92

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