@Shawn I suspect that these users are auto created, which allows you to integrate with Slack, Automation for jira, jira Outlook, Jira App chat applications, I suppose you can't remove them your self, but Atlassian who are managing the Jira core cloud application you can wait here for them to reply.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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