Added i8 for DQMatMulCwi (openvinotoolkit#27112)

### Details:
 - *Added i8 for DQMatMulCwi*

### Tickets:
 - *N/A*

---------

Co-authored-by: Dmitry Matveev <dmitry.matveev@intel.com>

Author: 2 people

src/plugins/intel_npu/src/plugin/npuw/partitioning/patterns/opt.cpp

@@ -149,8 +149,9 @@ DQMatMulCWi::DQMatMulCWi() {
 
         auto qcoeff_shape = matched_qcoeff->output(0).get_shape();
 
-        if (ov::element::i4 == matched_qweight->get_element_type() && qcoeff_shape[1] == 1 &&
-            !matched_matmul->get_transpose_a() && matched_matmul->get_transpose_b()) {
+        if ((ov::element::i4 == matched_qweight->get_element_type() ||
+             ov::element::i8 == matched_qweight->get_element_type()) &&
+            qcoeff_shape[1] == 1 && !matched_matmul->get_transpose_a() && matched_matmul->get_transpose_b()) {
             auto matched_node_cvtw = node_to_output.at(qcvtw).get_node_shared_ptr();
             auto matched_node_cvtm = node_to_output.at(qcvtm).get_node_shared_ptr();
             auto matched_node_muls = node_to_output.at(qmuls).get_node_shared_ptr();