Revert "add clean workspace to jenkins templates"

This reverts commit a89fd1e4d9c91c1cde675c11c0b3d86cbf2ff0fe.

snippets/jenkins/template/general/Jenkinsfile

@@ -35,8 +35,5 @@ pipeline {
                 }
             }
         }
-        cleanup {
-            cleanWs()
-        }
     }
 }

snippets/jenkins/template/node/Jenkinsfile

@@ -20,10 +20,4 @@ pipeline {
             }
         }
     }
-
-    post {
-        cleanup {
-            cleanWs()
-        }
-    }
 }