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>

model/user.go

@@ -18,9 +18,10 @@ import (
 	"time"
 	"unicode/utf8"
 
-	"github.com/mattermost/mattermost-server/v5/services/timezones"
 	"golang.org/x/crypto/bcrypt"
 	"golang.org/x/text/language"
+
+	"github.com/mattermost/mattermost-server/v5/services/timezones"
 )
 
 const (