InteractiveTable: Add expand all to column (#84966)

* feat: add expand all to InteractiveTable

* chore: pr feedback; type tightening and better testing practice

* chore: pr feedback; type cleanup

packages/grafana-ui/src/components/InteractiveTable/InteractiveTable.mdx

@@ -111,6 +111,7 @@ export const MyComponent = () => {
       data={tableData}
       getRowId={(r) => r.datasource}
       renderExpandedRow={ExpandedCell}
+      showExpandAll
     />
   );
 };