Move playbooks to plugin (#23732)

* Remove build references

* Remove playbooks webapp and server, and add the prepackaged plugin

* Remove translations

* Add ProductSettings to the playwright type

* Restore playbooks as a prepackaged plugin for cypress e2e tests

server/cmd/mattermost/main.go

@@ -17,7 +17,6 @@ import (
 
 	// Blank imports for each product to register themselves
 	_ "github.com/mattermost/mattermost/server/v8/boards/product"
-	_ "github.com/mattermost/mattermost/server/v8/playbooks/product"
 )
 
 func main() {