fix: deduplicate OpenAPI definitions for GVKParser (#587) (#589) (2.10)

[crenshaw-dev]

• fix: deduplicate OpenAPI definitions for GVKParser

• do the thing that was the whole point

• more logs

• don't uniquify models

• schema for both

• more logs

• fix logic

• better tainted gvk handling, better docs, update mocks

• add a test

• improvements from comments

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