fix: users can be removed from all groups in Web UI

[maxrussell]

Ticket

DET-10246

Description

Validation was keeping us from removing all groups from a user in the Web UI. This fixes that.

Test Plan

1. Turn on RBAC or use a cluster with RBAC enabled
2. Create a user
3. Add the user to one group (can be a new group if you'd like)
4. While logged in as an admin in the Web UI, navigate to the Admin Settings page (/admin/user-management)
5. Use the kebab menu next to your new user and select "Manage Groups"
6. Remove all groups from the list of groups to which the user should belong
7. The app should let you click "Save," removing the user from all groups
8. Verify the user isn't in the group in the CLI by using det user-group describe GroupName (substituting the real group name you chose into the command)

Checklist

• Changes have been manually QA'd

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 37.95%. Comparing base (7aa5d5d) to head (ede6398).
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9259      +/-   ##
==========================================
- Coverage   44.69%   37.95%   -6.75%     
==========================================
  Files        1270      946     -324     
  Lines      155186   115571   -39615     
  Branches     2435     2436       +1     
==========================================
- Hits        69368    43866   -25502     
+ Misses      85582    71469   -14113     
  Partials      236      236              

Flag	Coverage Δ
harness	?
web	35.18% <33.33%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
webui/react/src/components/ManageGroupsModal.tsx	47.32% <33.33%> (-21.20%)	⬇️

... and 324 files with indirect coverage changes

[johnkim-det]

could we do this with something like disabled: _.isEqual(userGroups, groupsValue) to still prevent submitting when no changes are made while allowing an empty array value?

[maxrussell]

Good idea, @johnkim-det. Updated.

[johnkim-det]

LGTM thanks for the change