goimports (#16640)

* format using `goimports -local github.com/mattermost/mattermost-server/v5 -w`

* added goimports lint check to .golangci.yml

* format using `goimports -local github.com/mattermost/mattermost-server/v5 -w` for a corner case

* make app-layers, *-mocks and store-layers for ci check

Co-authored-by: Mahmudul Haque <mahmudulhaque@protonmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

services/mfa/mfa.go

@@ -10,10 +10,11 @@ import (
 	"strings"
 
 	"github.com/dgryski/dgoogauth"
+	"github.com/mattermost/rsc/qr"
+
 	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/services/configservice"
 	"github.com/mattermost/mattermost-server/v5/store"
-	"github.com/mattermost/rsc/qr"
 )
 
 const (

services/mfa/mfa_test.go

@@ -11,13 +11,13 @@ import (
 	"time"
 
 	"github.com/dgryski/dgoogauth"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
 	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/plugin/plugintest/mock"
 	"github.com/mattermost/mattermost-server/v5/store/storetest/mocks"
 	"github.com/mattermost/mattermost-server/v5/utils/testutils"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 )
 
 func TestGenerateSecret(t *testing.T) {