[MM-55268] Implement ServeMetrics plugins hook (#24249)

* Implement ServeMetrics plugins hook

* Update error id

* Simplify

* Revert "Simplify"

This reverts commit c9dc5d5eac6c933ff69e158cf3e34d0973bd3bcd.

* Add comment and error handler

* Wrap error

* Update translation file

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/plugin/hooks_timer_layer_generated.go

@@ -244,3 +244,9 @@ func (hooks *hooksTimerLayer) UserHasBeenDeactivated(c *Context, user *model.Use
 	hooks.hooksImpl.UserHasBeenDeactivated(c, user)
 	hooks.recordTime(startTime, "UserHasBeenDeactivated", true)
 }
+
+func (hooks *hooksTimerLayer) ServeMetrics(c *Context, w http.ResponseWriter, r *http.Request) {
+	startTime := timePkg.Now()
+	hooks.hooksImpl.ServeMetrics(c, w, r)
+	hooks.recordTime(startTime, "ServeMetrics", true)
+}