fix(api): add patch step api and consolidate post update processing

[tatarco]

What changed? Why was the change needed?

1. Added a Patch Step supporting name + control values.
2. Add e2e tests to validate the behavior stays consistent.
3. Deprecate (but not delete) existing way of updating to not break FE.
4. migrate internals into a joint logic for upsert and patch in order to remove it easily next week.
5. consolidate postprocess logic (issues + payload schema builder) to work after patch & upsert to keep a consistent behavior

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

[linear[bot]]

NV-4758 Create a PATCH step

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commit: 9b34609