Correcting the response format for ingest simulate (#3640) (#3699)

* Correcting the response format for ingest simulate

* code review feedback

* moving error to the correct place, and adding ignored_fields

* Update specification/simulate/ingest/SimulateIngestResponse.ts

Co-authored-by: Laura Trotta <[email protected]>

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Co-authored-by: Laura Trotta <[email protected]>
(cherry picked from commit 03651cc)

Co-authored-by: Keith Massey <[email protected]>

Author: github-actions[bot]