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Remove the djangoapp directory, including migrations, along with any reference to it in INSTALLED_APPS.
Add a note to the next named release page about the tables that have been removed so the community knows to clean them up themselves if necessary. If there is a desire for the open edX community to have an automated migration to remove the app's tables, then you will want to hold off on releasing this step until the following open edX named release.
Merge in this PR after tests pass and the code has the required approvals.
Example: https://github.com/edx/edx-platform/pull/21380
Step 4: Remove permissions related to this djangoapp in app-permissions
If this djangoapp was accessible through django admin, there will probably be app-permissions associated with this djangoapp that will need to be removed quickly from the app-permissions repo by a 2U employee (2U internal only): https://github.com/edx/app-permissions
Remove all entries related to this djangoapp from the app-permissions repo & notify IT of the change.