fix: update IPX definition

[dguerinCoveo]

Update the IPX definition based on the latest changes

Acceptance Criteria

• My changes are publicly available, documented, and deployed in production. (i.e. on Swagger)
• JSDoc annotates each property added in the exported interfaces
• The proposed changes are covered by unit tests
• Commits containing breaking changes a properly identified as such
• README.md is adjusted to reflect the proposed changes (if relevant)
• My merge commit message will be conventional (See Conventional Commit)

[louis-bompart]

A bit confused here: this looks almost like unused code.
Like, there are only interfaces and it's not used apart from being exported.

I reckon this is because as discussed in #597, the feature that those interfaces describe is not ready for production.
I'd suggest either considering all changes relative to the IPX fixes from a conventional commit standpoint, or putting the interface declaration with your logic, and only updating it there when you're finally ready to make the API Public and documented.

[dguerinCoveo]

Yeah the routes are not prod ready yet since they are under a feature flag. I've updated the commit to flag it as non-breaking

[github-actions]

🎉 This PR is included in version 40.9.3 🎉

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• npm package (@latest dist-tag)
• GitHub release

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