Return 206 with op: "StepNotFound" when no step found to run

[jpwilliams]

Summary

If a step is intended to be run and was not found due to non-determinism or a changed function, still return a 206 with the "StepNotFound" opcode.

This complements inngest/inngest#1715 to ensure we recover from these situations gracefully.

Checklist

• Added a docs PR that references this PR N/A Bug fix
• Added unit/integration tests
• Added changesets if applicable

Related

• Fix handling of StepNotFound inngest#1715

[changeset-bot]

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Latest commit: 0a1303b

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