fix(project): modify endpoint return type

[agong-coveo]

• Made a mistake with the endpoint's return type when merging the original PR;
• To avoid forgetting anything, I've tested this endpoint with the feature that I'm currently developing.

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)

[toofff]

LGTM

[github-actions]

🎉 This PR is included in version 54.7.2 🎉

The release is available on:

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

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