[CI] Add stage name in the step (elastic#21887)

Jenkinsfile

@@ -206,7 +206,7 @@ def target(Map args = [:]) {
         // make commands use -C <folder> while mage commands require the dir(folder)
         // let's support this scenario with the location variable.
         dir(isMage ? directory : '') {
-          cmd(label: "${command}", script: "${command}")
+          cmd(label: "${args.id?.trim() ? args.id : env.STAGE_NAME} - ${command}", script: "${command}")
         }
       }
     }