Populate project form with `project.users` instead of `project.project.additional_users`

[camdendotlol]

Summary

• uses project.users instead of project.project.additional_users to populate the list of users in the project edit form
• moves the user list fetching code from getProjects to getProject, fixing an issue where the project.users array would only contain the person currently signed into AVAnnotate instead of all users from the repo on any page other than the project list page
• replaces two instances of "Recogito" with "AVAnnotate" on the error pages
• adds a key prop to the tooltip trigger in ProjectCard to fix a React warning about missing keys
• adds a type='button' attribute to the user delete button in the project settings form, fixing an issue where the form would submit instead of running handleDeleteUser
• filters the list of additional_users on the project settings page to only show non-admins, as the ability to remove admins can lead to strange behavior

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