feat(ml): add missing model types for genqa

[aboissinot-coveo]

Description

SEARCHAPI-9039

Add missing ML model types in Enum.ts.

• IntentAwareProductRanking = 'intentranking'
• RelevanceGenerativeAnswering = 'genqa'
• SemanticSearch = 'embeddings'

I looked in the backend to confirm the values.

I also had a discussion with UI ML team about it. They told me they have a duplicated enum in the admin-ui.

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)

[lprovost-coveo]

I'm approving but I would rather us maintain this outside of platform-client. Also this enum also contains random stuff "useractionhistory" is not even a modeltype.

I really suggest not leveraging this enum.

[github-actions]

🎉 This PR is included in version 48.4.0 🎉

The release is available on:

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

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