un-pub DeserializedMetadataAndRawRows::new_for_test

This function is only used by in-crate tests. It can be safely made
pub(crate), and even cfg(test), instead of being doc(hidden).

Author: Lorak-mmk

scylla-cql/src/frame/response/result.rs

@@ -1284,8 +1284,8 @@ mod test_utils {
 
     impl DeserializedMetadataAndRawRows {
         #[inline]
-        #[doc(hidden)]
-        pub fn new_for_test(
+        #[cfg(test)]
+        pub(crate) fn new_for_test(
             metadata: ResultMetadata<'static>,
             rows_count: usize,
             raw_rows: Bytes,