[MM-52924] Implement ConfigurationWillBeSaved plugin hook (#23567)

* Implement ConfigurationWillBeSaved plugin hook

* Add comment

* Update comment

* Fix potential nil dereference if plugin environment is unset

* Address PR review

server/public/plugin/hooks_timer_layer_generated.go

@@ -253,3 +253,10 @@ func (hooks *hooksTimerLayer) GetTopicMetadataByIds(c *Context, topicType string
 	hooks.recordTime(startTime, "GetTopicMetadataByIds", _returnsB == nil)
 	return _returnsA, _returnsB
 }
+
+func (hooks *hooksTimerLayer) ConfigurationWillBeSaved(newCfg *model.Config) (*model.Config, error) {
+	startTime := timePkg.Now()
+	_returnsA, _returnsB := hooks.hooksImpl.ConfigurationWillBeSaved(newCfg)
+	hooks.recordTime(startTime, "ConfigurationWillBeSaved", _returnsB == nil)
+	return _returnsA, _returnsB
+}