Fix NuGet search endpoints (#25613) (#26499)

Backport of #25613

Fixes #25564
Fixes #23191

- Api v2 search endpoint should return only the latest version matching
the query
- Api v3 search endpoint should return `take` packages not package
versions

models/db/common.go

@@ -20,3 +20,19 @@ func BuildCaseInsensitiveLike(key, value string) builder.Cond {
 	}
 	return builder.Like{"UPPER(" + key + ")", strings.ToUpper(value)}
 }
+
+// BuilderDialect returns the xorm.Builder dialect of the engine
+func BuilderDialect() string {
+	switch {
+	case setting.Database.Type.IsMySQL():
+		return builder.MYSQL
+	case setting.Database.Type.IsSQLite3():
+		return builder.SQLITE
+	case setting.Database.Type.IsPostgreSQL():
+		return builder.POSTGRES
+	case setting.Database.Type.IsMSSQL():
+		return builder.MSSQL
+	default:
+		return ""
+	}
+}