v8.0 module release (#22975)

https://mattermost.atlassian.net/browse/MM-52079

```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```


Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/channels/jobs/migrations/advanced_permissions_phase_2.go

@@ -9,8 +9,8 @@ import (
 	"net/http"
 	"strings"
 
-	"github.com/mattermost/mattermost-server/v6/model"
-	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+	"github.com/mattermost/mattermost-server/server/v8/model"
+	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mlog"
 )
 
 type AdvancedPermissionsPhase2Progress struct {

server/channels/jobs/migrations/helper_test.go

@@ -6,8 +6,8 @@ package migrations
 import (
 	"testing"
 
-	"github.com/mattermost/mattermost-server/v6/model"
-	"github.com/mattermost/mattermost-server/v6/server/channels/store"
+	"github.com/mattermost/mattermost-server/server/v8/channels/store"
+	"github.com/mattermost/mattermost-server/server/v8/model"
 )
 
 func Setup(tb testing.TB) store.Store {

server/channels/jobs/migrations/main_test.go

@@ -6,7 +6,7 @@ package migrations
 import (
 	"testing"
 
-	"github.com/mattermost/mattermost-server/v6/server/channels/testlib"
+	"github.com/mattermost/mattermost-server/server/v8/channels/testlib"
 )
 
 var mainHelper *testlib.MainHelper

server/channels/jobs/migrations/migrations.go

@@ -6,8 +6,8 @@ package migrations
 import (
 	"net/http"
 
-	"github.com/mattermost/mattermost-server/v6/model"
-	"github.com/mattermost/mattermost-server/v6/server/channels/store"
+	"github.com/mattermost/mattermost-server/server/v8/channels/store"
+	"github.com/mattermost/mattermost-server/server/v8/model"
 )
 
 const (

server/channels/jobs/migrations/migrations_test.go

@@ -9,7 +9,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/server/v8/model"
 )
 
 func TestGetMigrationState(t *testing.T) {

server/channels/jobs/migrations/scheduler.go

@@ -6,10 +6,10 @@ package migrations
 import (
 	"time"
 
-	"github.com/mattermost/mattermost-server/v6/model"
-	"github.com/mattermost/mattermost-server/v6/server/channels/jobs"
-	"github.com/mattermost/mattermost-server/v6/server/channels/store"
-	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+	"github.com/mattermost/mattermost-server/server/v8/channels/jobs"
+	"github.com/mattermost/mattermost-server/server/v8/channels/store"
+	"github.com/mattermost/mattermost-server/server/v8/model"
+	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mlog"
 )
 
 const (

server/channels/jobs/migrations/worker.go

@@ -9,10 +9,10 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/mattermost/mattermost-server/v6/model"
-	"github.com/mattermost/mattermost-server/v6/server/channels/jobs"
-	"github.com/mattermost/mattermost-server/v6/server/channels/store"
-	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+	"github.com/mattermost/mattermost-server/server/v8/channels/jobs"
+	"github.com/mattermost/mattermost-server/server/v8/channels/store"
+	"github.com/mattermost/mattermost-server/server/v8/model"
+	"github.com/mattermost/mattermost-server/server/v8/platform/shared/mlog"
 )
 
 const (