Merge #5232

5232: Stabilize vector store feature r=Kerollmops a=dureuill

# Pull Request

## Related issue
Fixes #4733 

## What does this PR do?
- `vectorStore` feature can no longer be set or get from `/experimental-features`
- That feature has been removed, and there is no longer any check for its activation
- Always display `embedders` in the settings, even if empty
- Always hide `_vectors` in documents, unless `retrieveVectors: true`
- Make error codes consistent with the usual nomenclature
- Update tests as needed


Co-authored-by: Louis Dureuil <louis@meilisearch.com>

crates/index-scheduler/src/features.rs

@@ -56,19 +56,6 @@ impl RoFeatures {
         }
     }
 
-    pub fn check_vector(&self, disabled_action: &'static str) -> Result<()> {
-        if self.runtime.vector_store {
-            Ok(())
-        } else {
-            Err(FeatureNotEnabledError {
-                disabled_action,
-                feature: "vector store",
-                issue_link: "https://github.com/meilisearch/product/discussions/677",
-            }
-            .into())
-        }
-    }
-
     pub fn check_edit_documents_by_function(&self, disabled_action: &'static str) -> Result<()> {
         if self.runtime.edit_documents_by_function {
             Ok(())