Merge branch 'branch-0.5.0' into 'branch-0.5.0'

fix jenkins build

See merge request megasearch/milvus!713

Former-commit-id: 75cebda25742b7863e11be5e9ce0d34779c99679

ci/jenkinsfile/packaged_milvus.groovy

 container('milvus-build-env') {
     timeout(time: 5, unit: 'MINUTES') {
         dir ("milvus_engine") {
-            dir ("cpp") {
+            dir ("core") {
                 gitlabCommitStatus(name: 'Packaged Engine') {
                     if (fileExists('milvus')) {
                         try {

ci/jenkinsfile/packaged_milvus_no_ut.groovy

 container('milvus-build-env') {
     timeout(time: 5, unit: 'MINUTES') {
         dir ("milvus_engine") {
-            dir ("cpp") {
+            dir ("core") {
                 gitlabCommitStatus(name: 'Packaged Engine') {
                     if (fileExists('milvus')) {
                         try {