Added buttons to select/deselect all user scopes.

[barankyle]

Summary

Clicking every scope when making a new admin was annoying, so buttons were added to select or deselect all
scopes.

Removed zero scopes selected as an error condition. Updated backend scope logic to handle an empty array
for scope update.

References

closes #insert number here

Checklist

• If this PR is still a WIP, convert to a draft
• ensure all checks pass
• When this PR is ready, mark it as "Ready for review"
• Changes have been manually QA'd
• Changes reviewed by at least 2 approved reviewer

QA Steps

List any additional steps required to QA the changes of this PR, as well as any supplemental images or videos.