[MM-19948] Set version on module file and internal paths (#13186)

* [MM-19948] Set version on module file and internal paths

* Fixes after merge

* Fix i18n checker error

plugin/interface_generator/main.go

@@ -379,7 +379,7 @@ func generateGlue(info *PluginInterfaceInfo) {
 }
 
 func getPluginPackageDir() string {
-	dirs, err := goList("github.com/mattermost/mattermost-server/plugin")
+	dirs, err := goList("github.com/mattermost/mattermost-server/v5/plugin")
 	if err != nil {
 		panic(err)
 	} else if len(dirs) != 1 {