Preserve rawData to fix filtering on split tables. (#33886)

When the legacy response handler was created specifically for table vis,
`rawData` was no longer attached to the `AggConfigResult`s returned from
the handler. This caused filtering on individual table cells to fail
when using split rows/tables, because `vis_filters` could not find the
`rawData` it needed to generate the filter.

This issue only affects 6.6/6.7, as the response handler was removed in
subsequent versions.

Fixes #32529.

src/legacy/core_plugins/table_vis/public/__tests__/_legacy_response_handler.js

@@ -128,6 +128,16 @@ describe('Table Vis Legacy Response Handler', () => {
       expect(actual.map(i => i.title)).to.eql(expected);
     });
 
+    it('should return the correct rawData', () => {
+      const expected = {
+        table: { columns, rows },
+        column: 0,
+        row: -1,
+      };
+      const actual = splitTable(columns, rows, null);
+      expect(actual.map(i => i.$parent.rawData)).to.eql([expected, expected, expected]);
+    });
+
     it('should return nested split tables with the correct number of entries', () => {
       const expected = [2, 1, 3];
       const actual = splitTable(columns, rows, null);

src/legacy/core_plugins/table_vis/public/legacy_response_handler.js

@@ -89,6 +89,11 @@ export function splitTable(columns, rows, $parent) {
 
   return splitRows.results.map(splitValue => {
     const $newParent = new AggConfigResult(splitColumn.aggConfig, $parent, splitValue, splitValue);
+    $newParent.rawData = {
+      table: { columns, rows },
+      column: splitColumnIndex,
+      row: -1, // For split buckets, we don't need the actual row for filters, just the provided value.
+    };
     return {
       $parent: $newParent,
       aggConfig: splitColumn.aggConfig,