CI: Reverse allowing failure of IT_012

.gitlab/ci/target-test.yml

@@ -1046,7 +1046,6 @@ IT_011:
 IT_012:
   extends: .integration_test_template
   parallel: 2
-  allow_failure: true  # FIXME: temporary allow failure, IDFCI-1147
   tags:
     - ESP32_IDF
     - SSC_T2_MESH1