Warn when deleting roles bound to groups

[Copilot]

Summary

Fixes #6844

Role deletion only warned about bound users, not groups. Now warns about both.

Occurred changes and/or fixed issues

• Extended roleDeletionCheck.js mixin to collect groupPrincipalName from role bindings
• Updated translations to include groups in all warning messages:
  • "No users or groups bound"
  • "Checking if there are any users or groups bound..."
  • New bound key with plural handling for users/groups combinations
• Removed deprecated usersBound translation key

Technical notes summary

Groups are identified via groupPrincipalName on role bindings (vs userName for users). The warning message now uses a nested ICU plural format to handle all combinations:

• Only users (1 or many)
• Only groups (1 or many)
• Both users and groups (all singular/plural combinations)

Areas or cases that should be tested

1. Setup Auth Provider (e.g., GitHub)
2. Navigate to Users & Authentication → Groups → Assign Global Roles
3. Assign a role (e.g., "Manage Settings") to a group
4. Navigate to Roles and try to delete the assigned role
5. Verify warning shows group count

Test cases:

• Role with only users bound → shows user count
• Role with only groups bound → shows group count
• Role with both → shows both counts
• Role with no bindings → shows "No users or groups bound"

Tested in Chrome.

Areas which could experience regressions

• Role deletion flow for GlobalRoles
• Role deletion flow for ClusterRoleTemplates and ProjectRoleTemplates

Screenshot/Video

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes
• The PR has been reviewed in terms of Accessibility
• The PR has considered, and if applicable tested with, the three Global Roles Admin, Standard User and User Base

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Warn when deleting roles bound to groups</issue_title>
<issue_description><!--------- For bugs and general issues --------->
Setup

• Rancher version: 2.7.0

Describe the bug
This follows on from #6578. The current implementation only applies to users bound to roles. We also need to cover groups boun to roles

To Reproduce

1. Setup an Auth Provider (for dev github is pretty straight forward)
2. Nav to Users & Authentication --> Groups --> Assign Global Roles and assign a Role such as Manage Settings to a group associated with the Auth Provider
3. Nav to Roles and try to delete the role assigned to the group

Result

• See screen shot, we show no users bound but not that 1 group is bound

Expected Result

• We should warn users if either users or groups are bound to the role/s that will be deleted

Screenshots

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Warn when deleting roles bound to groups #7199

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