Zero out other half of int64 for hash (openvinotoolkit#2157)

Author: Wovchena

src/cpp/src/sequence_group.cpp

@@ -68,7 +68,7 @@ size_t Sequence::_make_hash(size_t content_length) {
 
 std::vector<int64_t> Sequence::_reduce_embedding(const std::vector<float>& embedding) {
     size_t res_size = std::min((size_t)ceil(float(embedding.size()) / m_embeddings_hash_calculation_stride), m_embeddings_hash_max_num_values);
-    std::vector<int64_t> res(res_size);
+    std::vector<int64_t> res(res_size, 0);
     for (size_t i = 0, idx=0; idx < res_size; i+= m_embeddings_hash_calculation_stride, idx++) {
         std::memcpy(&(res[idx]), &(embedding[i]), sizeof(embedding[i]));
     }