feat(api): Add Error Handling 2XX issues

[tatarco]

What changed? Why was the change needed?

Added Issues to error handling,

1. Added issues field on the workflows.
2. Added issues field on the steps, supports step + content.
3. Issues are persisted as a part of the upsert so it's available in the get as well

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Related enterprise PR

Special notes for your reviewer

[linear]

NV-4535 Workflow Editor - error handling logic

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