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/scripts/config_generator/main.go

@@ -8,7 +8,7 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
+	"github.com/mattermost/mattermost/server/public/model"
 )
 
 // generateDefaultConfig writes default config to outputFile.

server/scripts/config_generator/main_test.go

@@ -8,7 +8,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/mattermost/mattermost-server/server/public/model"
+	"github.com/mattermost/mattermost/server/public/model"
 
 	"github.com/stretchr/testify/require"
 )