Refactor organization and user management components/tests for simplification and improved clarity

- Removed unused properties (`slug`, `is_active`, etc.) in organization and user-related components and test data.
- Simplified function data typing by removing redundant `any` usage.
- Updated `params` in `OrganizationMembersPage` for Promise resolution and async handling.
- Cleaned up unused variables and streamlined form handling in `AddMemberDialog`.

frontend/src/components/admin/users/UserManagementContent.tsx

@@ -86,8 +86,8 @@ export function UserManagementContent() {
   const handleSelectAll = (selected: boolean) => {
     if (selected) {
       const selectableUsers = users
-        .filter((u: any) => u.id !== currentUser?.id)
-        .map((u: any) => u.id);
+        .filter((u) => u.id !== currentUser?.id)
+        .map((u) => u.id);
       setSelectedUsers(selectableUsers);
     } else {
       setSelectedUsers([]);