[v1.11.0] Fix AI-powered search feature following breaking changes

[curquiza]

Related to meilisearch/integration-guides#303

Explanation of the feature

Usage: https://meilisearch.notion.site/v1-11-AI-search-changes-0e37727193884a70999f254fa953ce6e?pvs=74

Breaking:

• When using the semantic or the hybrid search, hybrid.embedder is now a mandatory parameter in GET and POST /indexes/{:indexUid}/search
• As a consequence, it is now mandatory to pass hybrid even for full-vector search (with only vector and not q)
• embedder is now a mandatory parameter in GET and POST /indexes/{:indexUid}/similar
• Ignore non-zero semanticRatio when vector is passed but not q: a semantic search will be performed.
• The default model for OpenAI is now text-embedding-3-small instead of text-embedding-ada-002.

TODO

• Ensure the breaking changes are applied in the code base
• Fix tests failing due to the of breaking changes

⚠️ Make PRs pointing to bump-meilisearch-v1.11.0 and NOT main. Please do 1 PR for all of these changes, and not several.

[curquiza]

Closed by #577