[CI] refactor runbld post build action (elastic#21256)

Jenkinsfile

@@ -13,7 +13,8 @@ pipeline {
   agent { label 'ubuntu-18 && immutable' }
   environment {
     AWS_ACCOUNT_SECRET = 'secret/observability-team/ci/elastic-observability-aws-account-auth'
-    BASE_DIR = 'src/github.com/elastic/beats'
+    REPO = 'beats'
+    BASE_DIR = "src/github.com/elastic/${env.REPO}"
     DOCKERELASTIC_SECRET = 'secret/observability-team/ci/docker-registry/prod'
     DOCKER_COMPOSE_VERSION = "1.21.0"
     DOCKER_REGISTRY = 'docker.elastic.co'
@@ -121,7 +122,7 @@ pipeline {
   }
   post {
     always {
-      runbld()
+      runbld(stashedTestReports: stashedTestReports, project: env.REPO)
     }
     cleanup {
       notifyBuildResult(prComment: true)
@@ -347,7 +348,7 @@ def archiveTestOutput(Map args = [:]) {
     }
     cmd(label: 'Prepare test output', script: 'python .ci/scripts/pre_archive_test.py')
     dir('build') {
-      junitAndStore(allowEmptyResults: true, keepLongStdio: true, testResults: args.testResults, id: args.id)
+      junitAndStore(allowEmptyResults: true, keepLongStdio: true, testResults: args.testResults, stashedTestReports: stashedTestReports, id: args.id)
       archiveArtifacts(allowEmptyArchive: true, artifacts: args.artifacts)
     }
     catchError(buildResult: 'SUCCESS', message: 'Failed to archive the build test results', stageResult: 'SUCCESS') {
@@ -361,50 +362,6 @@ def archiveTestOutput(Map args = [:]) {
   }
 }
 
-/**
-* This method wraps the junit built-in step to archive the test reports that gonna be populated later on
-* with the runbld post build step.
-*/
-def junitAndStore(Map args = [:]) {
-  junit(args)
-  // args.id could be null in some cases, so let's use the currentmilliseconds
-  def stageName = args.id ? args.id?.replaceAll("[\\W]|_",'-') : "uncategorized-${new java.util.Date().getTime()}"
-  stash(includes: args.testResults, allowEmpty: true, name: stageName, useDefaultExcludes: true)
-  stashedTestReports[stageName] = stageName
-}
-
-/**
-* This method populates the test output using the runbld approach. For such it requires the
-* global variable stashedTestReports.
-* TODO: should be moved to the shared library
-*/
-def runbld() {
-  catchError(buildResult: 'SUCCESS', message: 'runbld post build action failed.') {
-    if (stashedTestReports) {
-      def jobName = isPR() ? 'elastic+beats+pull-request' : 'elastic+beats'
-      deleteDir()
-      unstashV2(name: 'source', bucket: "${JOB_GCS_BUCKET}", credentialsId: "${JOB_GCS_CREDENTIALS}")
-      dir("${env.BASE_DIR}") {
-        // Unstash the test reports
-        stashedTestReports.each { k, v ->
-          dir(k) {
-            unstash(v)
-          }
-        }
-      }
-      sh(label: 'Process JUnit reports with runbld',
-        script: """\
-        ## for debugging purposes
-        find . -name "TEST-*.xml"
-        cat >./runbld-script <<EOF
-        echo "Processing JUnit reports with runbld..."
-        EOF
-        /usr/local/bin/runbld ./runbld-script --job-name ${jobName}
-        """.stripIndent())  // stripIdent() requires '''/
-    }
-  }
-}
-
 /**
 * This method executes a closure with credentials for cloud test
 * environments.