[MM-61512] Fix errcheck issues in server/channels/app/users/helper_test.go (#29167)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -150,7 +150,6 @@ issues:
         channels/app/upload_test.go|\
         channels/app/user.go|\
         channels/app/user_test.go|\
-        channels/app/users/helper_test.go|\
         channels/app/web_broadcast_hooks_test.go|\
         channels/app/webhook_test.go|\
         channels/jobs/batch_worker_test.go|\

server/channels/app/users/helper_test.go

@@ -15,6 +15,7 @@ import (
 	"github.com/mattermost/mattermost/server/public/shared/request"
 	"github.com/mattermost/mattermost/server/v8/channels/store"
 	"github.com/mattermost/mattermost/server/v8/config"
+	"github.com/stretchr/testify/require"
 )
 
 var initBasicOnce sync.Once
@@ -45,7 +46,7 @@ func Setup(tb testing.TB) *TestHelper {
 	return setupTestHelper(dbStore, false, tb)
 }
 
-func setupTestHelper(s store.Store, includeCacheLayer bool, tb testing.TB) *TestHelper {
+func setupTestHelper(s store.Store, _ bool, tb testing.TB) *TestHelper {
 	tempWorkspace, err := os.MkdirTemp("", "userservicetest")
 	if err != nil {
 		panic(err)
@@ -69,7 +70,8 @@ func setupTestHelper(s store.Store, includeCacheLayer bool, tb testing.TB) *Test
 	*config.PasswordSettings.Uppercase = false
 	*config.PasswordSettings.Symbol = false
 	*config.PasswordSettings.Number = false
-	configStore.Set(config)
+	_, _, err = configStore.Set(config)
+	require.NoError(tb, err)
 
 	buffer := &bytes.Buffer{}
 	return &TestHelper{