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/searchquery/search.go

@@ -156,6 +156,7 @@ func Users(query string) (database.GetUsersParams, []codersdk.ValidationError) {
 	parser := httpapi.NewQueryParamParser()
 	filter := database.GetUsersParams{
 		Search:          parser.String(values, "", "search"),
+		Name:            parser.String(values, "", "name"),
 		Status:          httpapi.ParseCustomList(parser, values, []database.UserStatus{}, "status", httpapi.ParseEnum[database.UserStatus]),
 		RbacRole:        parser.Strings(values, []string{}, "role"),
 		LastSeenAfter:   parser.Time3339Nano(values, time.Time{}, "last_seen_after"),

coderd/searchquery/search_test.go

@@ -754,6 +754,49 @@ func TestSearchUsers(t *testing.T) {
 			},
 		},
 
+		// Name filter tests
+		{
+			Name:  "NameFilter",
+			Query: "name:John",
+			Expected: database.GetUsersParams{
+				Name:      "john",
+				Status:    []database.UserStatus{},
+				RbacRole:  []string{},
+				LoginType: []database.LoginType{},
+			},
+		},
+		{
+			Name:  "NameFilterQuoted",
+			Query: `name:"John Doe"`,
+			Expected: database.GetUsersParams{
+				Name:      "john doe",
+				Status:    []database.UserStatus{},
+				RbacRole:  []string{},
+				LoginType: []database.LoginType{},
+			},
+		},
+		{
+			Name:  "NameFilterWithSearch",
+			Query: "name:John search:johnd",
+			Expected: database.GetUsersParams{
+				Search:    "johnd",
+				Name:      "john",
+				Status:    []database.UserStatus{},
+				RbacRole:  []string{},
+				LoginType: []database.LoginType{},
+			},
+		},
+		{
+			Name:  "NameFilterWithOtherParams",
+			Query: "name:John status:active role:owner",
+			Expected: database.GetUsersParams{
+				Name:      "john",
+				Status:    []database.UserStatus{database.UserStatusActive},
+				RbacRole:  []string{codersdk.RoleOwner},
+				LoginType: []database.LoginType{},
+			},
+		},
+
 		// Failures
 		{
 			Name:                  "ExtraColon",