Export: support export in postgresql (#58553)

pkg/services/export/export_plugins.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"path"
-	"strings"
 	"time"
 
 	"github.com/grafana/grafana/pkg/infra/db"
@@ -29,7 +28,7 @@ func exportPlugins(helper *commitHelper, job *gitExportJob) error {
 
 		err := sess.Find(&rows)
 		if err != nil {
-			if strings.HasPrefix(err.Error(), "no such table") {
+			if isTableNotExistsError(err) {
 				return nil
 			}
 			return err