Resolve bug for batch action on post codes page

- User will be able to export in batches
- User will be able sort on the basis of created date

Signed-off-by: Sandeepa Singh <sandeepa.singh@ibm.com>
Change-Id: I6477e722f5aa8a2d19621fb3b851a6d2651634b0

src/views/Logs/PostCodeLogs/PostCodeLogs.vue

@@ -38,10 +38,10 @@
           :selected-items-count="selectedRows.length"
           @clear-selected="clearSelectedRows($refs.table)"
         >
-          <template #export>
+          <template #toolbar-buttons>
             <table-toolbar-export
               :data="batchExportData"
-              :file-name="exportFileNameByDate('export')"
+              :file-name="exportFileNameByDate()"
             />
           </template>
         </table-toolbar>
@@ -218,6 +218,7 @@ export default {
         {
           key: 'date',
           label: this.$t('pagePostCodeLogs.table.created'),
+          sortable: true,
         },
         {
           key: 'timeStampOffset',