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>

store/searchtest/channel_layer.go

@@ -6,9 +6,10 @@ package searchtest
 import (
 	"testing"
 
+	"github.com/stretchr/testify/require"
+
 	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/store"
-	"github.com/stretchr/testify/require"
 )
 
 var searchChannelStoreTests = []searchTest{

store/searchtest/helper.go

@@ -7,12 +7,12 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/mattermost/mattermost-server/v5/model"
-	"github.com/mattermost/mattermost-server/v5/store"
 	"github.com/pkg/errors"
-
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/mattermost/mattermost-server/v5/store"
 )
 
 type SearchTestHelper struct {

store/searchtest/post_layer.go

@@ -7,9 +7,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/require"
+
 	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/store"
-	"github.com/stretchr/testify/require"
 )
 
 var searchPostStoreTests = []searchTest{

store/searchtest/user_layer.go

@@ -6,9 +6,10 @@ package searchtest
 import (
 	"testing"
 
+	"github.com/stretchr/testify/require"
+
 	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/store"
-	"github.com/stretchr/testify/require"
 )
 
 var searchUserStoreTests = []searchTest{