fix(api): update previous step identifier to step id instead of inter…

[djabarovgeorge]

What changed? Why was the change needed?

Please do not review this PR, i still need to merge a fix to the workflow creation, that will make sure we store stepId.

Why?
Currently, we're using the internal ID "655b3427b8a8fe17cb62fe48" as the reference for the previous step. This means if a user wants to access variables from that step, they have to type something like {{steps.655b3427b8a8fe17cb62fe48.seen}}. This PR aims to improve the UX by allowing them to use a more readable format, like {{steps.in_app.seen}} (where "in_app" is the slugified step name).

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[SokratisVidros]

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