@rpayne To my knowledge, and per an escalation to Jamf Support, there is no official documentation around uninstalling Jamf Connect. In fact, information was provided to Jamf Support as to the observed "proper" method of uninstalling Jamf Connect components, with particular attention to /usr/local/bin/authchanger as it relates to Jamf Connect Login.
Caption of support case:
Please be advised that as /usr/local/bin/authchanger is part of the Jamf Connect Login package, and is not included on macOS by default, if the Jamf Connect Login package is "uninstalled" per indexing and a policy without first following the procedure relating to "Disabling and Re-enabling Azure loginwindow", the default macOS loginwindow will not load and the Jamf Connect Login package or the authchanger package will need to be reinstalled so that this task may be performed.
Reset loginwindow per
Unscope Configuration Profile -or- remove /Library/Preferences/com.jamf.connect.login.plist
Uninstall/remove package payload items:
As feedback from a customer perspective, it would be helpful if this "uninstall" procedure was documented somewhere, either in the Jamf Connect Login Administrator's Guide, or a separate KB document.