Add support for specifying mock results during action=preview
Previously, mock results were only generated from the JSON schema for the step type. This change allows for specification of a state object to flexibly and accurately display preview content that depends on other step results
Screenshots
N/A, see new tests in PR
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### Related enterprise PR
### Special notes for your reviewer
What changed? Why was the change needed?
action=preview
Screenshots
N/A, see new tests in PR
Expand for optional sections
### Related enterprise PR ### Special notes for your reviewer