Export: support export in postgresql (#58553)

pkg/services/export/export_usage.go

@@ -3,7 +3,6 @@ package export
 import (
 	"path"
 	"strconv"
-	"strings"
 
 	"github.com/grafana/grafana-plugin-sdk-go/data/sqlutil"
 
@@ -64,7 +63,7 @@ func exportUsage(helper *commitHelper, job *gitExportJob) error {
 		for _, usage := range dump {
 			rows, err := sess.DB().QueryContext(helper.ctx, usage.sql)
 			if err != nil {
-				if strings.HasPrefix(err.Error(), "no such table") {
+				if isTableNotExistsError(err) {
 					continue
 				}
 				return err