Resolve #3546404 "Un ignore all openapi"

Dave Longrequested to merge
issue/canvas-3546404:3546404-un-ignore-all-openapi into 1.x

Removed all ignores except the two that we still need from the config file, then fixed all the errors. Commits are grouped by type of error.

AI-Generated: Yes (Used Claude Code to find and fix the errors).

Testing instructions

  • Read the changes and make sure they make sense
  • Check the lint and tests pass

Closes #3546404

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