docs: public void verifyProcessDefinitionsDoNotShareKeys(
        Collection<ProcessDefinitionEntity> processDefinitions) {
      Set<String> keySet = new LinkedHashSet<String>();
      for (ProcessDefinitionEntity processDefinition : processDefinitions) {
        if (keySet.contains(processDefinition.getKey())) {
          throw new ActivitiException(
              "The deployment contains process definitions with the same key (process id attribute), this is not allowed");
        }
        keySet.add(processDefinition.getKey());
      }
    }