MM-53032: Fix module path after repo rename (#23689)

It was a good decision in hindsight to keep the public module as 0.x
because this would have been a breaking change again.

https://mattermost.atlassian.net/browse/MM-53032
```release-note
Changed the Go module path from github.com/mattermost/mattermost-server/server/v8 to github.com/mattermost/mattermost/server/v8.

For the public facing module, it's path is also changed from github.com/mattermost/mattermost-server/server/public to github.com/mattermost/mattermost/server/public
```

server/channels/app/email/email.go

@@ -15,11 +15,11 @@ import (
 
 	"github.com/pkg/errors"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
-	"github.com/mattermost/mattermost-server/server/public/shared/i18n"
-	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mail"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/templates"
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/shared/i18n"
+	"github.com/mattermost/mattermost/server/public/shared/mlog"
+	"github.com/mattermost/mattermost/server/v8/platform/shared/mail"
+	"github.com/mattermost/mattermost/server/v8/platform/shared/templates"
 
 	"github.com/microcosm-cc/bluemonday"
 )

server/channels/app/email/email_batching.go

@@ -14,9 +14,9 @@ import (
 	"sync"
 	"time"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
-	"github.com/mattermost/mattermost-server/server/public/shared/i18n"
-	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/shared/i18n"
+	"github.com/mattermost/mattermost/server/public/shared/mlog"
 )
 
 const (

server/channels/app/email/email_batching_test.go

@@ -12,7 +12,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
+	"github.com/mattermost/mattermost/server/public/model"
 )
 
 func TestHandleNewNotifications(t *testing.T) {

server/channels/app/email/email_test.go

@@ -12,8 +12,8 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mail"
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/v8/platform/shared/mail"
 )
 
 func TestCondenseSiteURL(t *testing.T) {

server/channels/app/email/helper_test.go

@@ -9,15 +9,15 @@ import (
 	"path/filepath"
 	"testing"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
-	"github.com/mattermost/mattermost-server/server/public/plugin/plugintest/mock"
-	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
-	"github.com/mattermost/mattermost-server/server/v8/channels/app/users"
-	"github.com/mattermost/mattermost-server/server/v8/channels/store"
-	"github.com/mattermost/mattermost-server/server/v8/channels/store/storetest/mocks"
-	"github.com/mattermost/mattermost-server/server/v8/channels/testlib"
-	"github.com/mattermost/mattermost-server/server/v8/config"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/templates"
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/plugin/plugintest/mock"
+	"github.com/mattermost/mattermost/server/public/shared/mlog"
+	"github.com/mattermost/mattermost/server/v8/channels/app/users"
+	"github.com/mattermost/mattermost/server/v8/channels/store"
+	"github.com/mattermost/mattermost/server/v8/channels/store/storetest/mocks"
+	"github.com/mattermost/mattermost/server/v8/channels/testlib"
+	"github.com/mattermost/mattermost/server/v8/config"
+	"github.com/mattermost/mattermost/server/v8/platform/shared/templates"
 )
 
 type TestHelper struct {

server/channels/app/email/main_test.go

@@ -7,7 +7,7 @@ import (
 	"flag"
 	"testing"
 
-	"github.com/mattermost/mattermost-server/server/v8/channels/testlib"
+	"github.com/mattermost/mattermost/server/v8/channels/testlib"
 )
 
 var mainHelper *testlib.MainHelper

server/channels/app/email/mocks/ServiceInterface.go

@@ -7,13 +7,13 @@ package mocks
 import (
 	io "io"
 
-	i18n "github.com/mattermost/mattermost-server/server/public/shared/i18n"
+	i18n "github.com/mattermost/mattermost/server/public/shared/i18n"
 
 	mock "github.com/stretchr/testify/mock"
 
-	model "github.com/mattermost/mattermost-server/server/public/model"
+	model "github.com/mattermost/mattermost/server/public/model"
 
-	templates "github.com/mattermost/mattermost-server/server/v8/platform/shared/templates"
+	templates "github.com/mattermost/mattermost/server/v8/platform/shared/templates"
 
 	throttled "github.com/throttled/throttled"
 )

server/channels/app/email/notification_email.go

@@ -10,10 +10,10 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
-	"github.com/mattermost/mattermost-server/server/public/shared/i18n"
-	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
-	"github.com/mattermost/mattermost-server/server/v8/channels/utils"
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/shared/i18n"
+	"github.com/mattermost/mattermost/server/public/shared/mlog"
+	"github.com/mattermost/mattermost/server/v8/channels/utils"
 )
 
 type FieldRow struct {

server/channels/app/email/notification_email_test.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
+	"github.com/mattermost/mattermost/server/public/model"
 )
 
 func TestProcessMessageAttachments(t *testing.T) {

server/channels/app/email/service.go

@@ -12,12 +12,12 @@ import (
 	"github.com/throttled/throttled"
 	"github.com/throttled/throttled/store/memstore"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
-	"github.com/mattermost/mattermost-server/server/public/shared/i18n"
-	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
-	"github.com/mattermost/mattermost-server/server/v8/channels/app/users"
-	"github.com/mattermost/mattermost-server/server/v8/channels/store"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/templates"
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/shared/i18n"
+	"github.com/mattermost/mattermost/server/public/shared/mlog"
+	"github.com/mattermost/mattermost/server/v8/channels/app/users"
+	"github.com/mattermost/mattermost/server/v8/channels/store"
+	"github.com/mattermost/mattermost/server/v8/platform/shared/templates"
 )
 
 const (

server/channels/app/email/utils.go

@@ -4,8 +4,8 @@
 package email
 
 import (
-	"github.com/mattermost/mattermost-server/server/v8/channels/utils"
-	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mail"
+	"github.com/mattermost/mattermost/server/v8/channels/utils"
+	"github.com/mattermost/mattermost/server/v8/platform/shared/mail"
 )
 
 func (es *Service) mailServiceConfig(replyToAddress string) *mail.SMTPConfig {