fix: resolve missing users in <UserCombobox /> (#21822)

Closes #21044

This pull-request addresses an issue we were seeing where we would
attempt to filter the `<UserCombobox />` by the users username or email
not their username (which the rendered options would show).

To highlight this I created three different users. Each with a username
that did not contain their `email` or `name` and attempted to filter.
Attempting to search for `John` wouldn't actually show the user as his
username was `x`, and infact whereas a subset of users might be returned
from the backend for having `john` in the `email` it would've been
filtered by the frontend for not being in the `name` field.

| Name | Username |
| --- | --- |
| `Jake` | `z` |  
| `Jeff` | `y` |
| `John` | `x` |

| Previously | Now |
| --- | --- |
| <img width="560" height="547" alt="OLD_USER_COMBOBOX"
src="https://github.com/user-attachments/assets/a0567264-0034-42ac-aba0-95b05c4f92dd"
/> | <img width="580" height="548" alt="NEW_USER_COMBOBOX"
src="https://github.com/user-attachments/assets/1aa0c942-d340-4b1c-8dde-b97879525bfb"
/> |

coderd/users.go

@@ -297,6 +297,7 @@ func (api *API) GetUsers(rw http.ResponseWriter, r *http.Request) ([]database.Us
 	userRows, err := api.Database.GetUsers(ctx, database.GetUsersParams{
 		AfterID:         paginationParams.AfterID,
 		Search:          params.Search,
+		Name:            params.Name,
 		Status:          params.Status,
 		RbacRole:        params.RbacRole,
 		LastSeenBefore:  params.LastSeenBefore,