Disable concurrent build for QA cluster CI (#15701)

Signed-off-by: Jenny Li <jing.li@zilliz.com>

.github/workflows/jenkins-checker.yaml

@@ -18,7 +18,7 @@ jobs:
       - name: Validate Jenkinsfile
         shell: bash
         run: |
-          JENKINS_URL=https://ci.milvus.io:18080/jenkins
+          JENKINS_URL=https://jenkins.milvus.io:18080
           # JENKINS_CRUMB is needed if your Jenkins controller has CRSF protection enabled as it should
           JENKINS_CRUMB=`curl "$JENKINS_URL/crumbIssuer/api/xml?xpath=concat(//crumbRequestField,\":\",//crumb)"`
 

build/ci/jenkins/qa/PR.groovy

@@ -12,6 +12,8 @@ pipeline {
         buildDiscarder logRotator(artifactDaysToKeepStr: '30')
         parallelsAlwaysFailFast()
         preserveStashes(buildCount: 5)
+        //Only keep the last build for one pr
+        disableConcurrentBuilds(abortPrevious: true)
 
     }
     agent {