feat(dashboard): In app template preview

[desiprisg]

What changed? Why was the change needed?

We don't have the test-data endpoint yet so can't prefill the field with the correct keys. We also dont have the step saving functionality so just getting the default values for the preview.

Screenshots

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### Related enterprise PR ### Special notes for your reviewer

[linear[bot]]

NV-4519 In-App Step Editor - the preview tab

[pkg-pr-new[bot]]

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commit: fd95baa

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