Fix type-checking errors in snippets (code only, no .md)

This commit both:
- Fixes pre-existing mistakes in snippets, aka wrong code samples.
- Adds hidden (`@hide`) statements that do not appear in the docs,
  but satisfy typecheckers.

qdrant-landing/content/documentation/headless/snippets/inference/ingest/go.go

@@ -2,7 +2,6 @@ package snippet
 
 import (
 	"context"
-	"time"
 
 	"github.com/qdrant/go-client/qdrant"
 )
@@ -15,7 +14,9 @@ func Main() {
 	    UseTLS: true,
 	})
 
-	client.Upsert(ctx, &qdrant.UpsertPoints{
+	if err != nil { panic(err) } // @hide
+
+	client.Upsert(context.Background(), &qdrant.UpsertPoints{
 		CollectionName: "{collection_name}",
 		Points: []*qdrant.PointStruct{
 			{

qdrant-landing/content/documentation/headless/snippets/inference/ingest/java.java

@@ -7,6 +7,7 @@ import static io.qdrant.client.VectorsFactory.namedVectors;
 
 import io.qdrant.client.QdrantClient;
 import io.qdrant.client.QdrantGrpcClient;
+import io.qdrant.client.grpc.Points.Document;
 import io.qdrant.client.grpc.Points.Image;
 import io.qdrant.client.grpc.Points.PointStruct;
 import java.util.List;

qdrant-landing/content/documentation/headless/snippets/inference/ingest/rust.rs

@@ -1,24 +1,26 @@
 use qdrant_client::{
-    Payload, Qdrant, QdrantError,
-    qdrant::{Document, PointStruct, UpsertPointsBuilder},
+    Payload, Qdrant,
+    qdrant::{DocumentBuilder, PointStruct, UpsertPointsBuilder},
 };
+use std::collections::HashMap;
 
 pub async fn main() -> anyhow::Result<()> {
     let client = Qdrant::from_url("<your-qdrant-url>").build()?;
 
     client
-        .upsert_points(UpsertPointsBuilder::new("{collection_name}",
-            vec![
-                PointStruct::new(1,
-                    HashMap::from([("my-bm25-vector".to_string(),
-                        Document {
-                          text: "Recipe for baking chocolate chip cookies".into(),
-                          model: "qdrant/bm25".into(),
-                          ..Default::default()
-                          }.into())]),
-                    Payload::default())
-                ]))
-            .await?;
+        .upsert_points(UpsertPointsBuilder::new(
+            "{collection_name}",
+            vec![PointStruct::new(
+                1,
+                HashMap::from([(
+                    "my-bm25-vector".to_string(),
+                    DocumentBuilder::new("Recipe for baking chocolate chip cookies", "qdrant/bm25")
+                        .build(),
+                )]),
+                Payload::default(),
+            )],
+        ))
+        .await?;
 
     Ok(())
 }