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/cmd/mmctl/commands/enterprise.go

@@ -13,8 +13,8 @@ import (
 	_ "github.com/hashicorp/memberlist"
 	_ "github.com/mattermost/gosaml2"
 	_ "github.com/mattermost/ldap"
-	_ "github.com/mattermost/mattermost-server/server/v8/channels/imports"
-	_ "github.com/mattermost/mattermost-server/server/v8/channels/utils/testutils"
+	_ "github.com/mattermost/mattermost/server/v8/channels/imports"
+	_ "github.com/mattermost/mattermost/server/v8/channels/utils/testutils"
 	_ "github.com/mattermost/rsc/qr"
 	_ "github.com/prometheus/client_golang/prometheus"
 	_ "github.com/prometheus/client_golang/prometheus/collectors"