feat(eventstore): increase parallel write capabilities (#5940)

This implementation increases parallel write capabilities of the eventstore.
Please have a look at the technical advisories: [05](https://zitadel.com/docs/support/advisory/a10005) and  [06](https://zitadel.com/docs/support/advisory/a10006).
The implementation of eventstore.push is rewritten and stored events are migrated to a new table `eventstore.events2`.
If you are using cockroach: make sure that the database user of ZITADEL has `VIEWACTIVITY` grant. This is used to query events.

internal/renderer/renderer.go

@@ -116,10 +116,8 @@ func (r *Renderer) addFileToTemplate(dir http.FileSystem, tmpl *template.Templat
 		return err
 	}
 	tmpl, err = tmpl.New(file.Name()).Funcs(funcs).Parse(string(content))
-	if err != nil {
-		return err
-	}
-	return nil
+
+	return err
 }
 
 func (r *Renderer) registerTranslateFn(req *http.Request, translator *i18n.Translator, funcs map[string]interface{}) map[string]interface{} {