Improve DataGrid boolean cell handling.

Allow boolean cells to be recognized as true if their text content is "true", in addition to having a `data-value` attribute, and ensure boolean cells have a `part` attribute.

Bug: 443727194
Change-Id: I1f079a45cc94fe056e275744573c527f0c3e9bba
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6948391
Reviewed-by: Philip Pfaffe <[email protected]>
Auto-Submit: Danil Somsikov <[email protected]>
Commit-Queue: Danil Somsikov <[email protected]>

Author: danilsomsikov

front_end/ui/legacy/components/data_grid/DataGridElement.ts

@@ -399,7 +399,7 @@ class DataGridElementNode extends SortableDataGridNode<DataGridElementNode> {
       const cell = cells[i];
       const column = this.#dataGridElement.columns[i];
       if (column.dataType === DataType.BOOLEAN) {
-        this.data[column.id] = hasBooleanAttribute(cell, 'data-value');
+        this.data[column.id] = hasBooleanAttribute(cell, 'data-value') || cell.textContent === 'true';
       } else {
         this.data[column.id] = cell.dataset.value ?? cell.textContent ?? '';
       }
@@ -472,7 +472,9 @@ class DataGridElementNode extends SortableDataGridNode<DataGridElementNode> {
   override createCell(columnId: string): HTMLElement {
     const index = this.#dataGridElement.columns.findIndex(({id}) => id === columnId);
     if (this.#dataGridElement.columns[index].dataType === DataType.BOOLEAN) {
-      return super.createCell(columnId);
+      const cell = super.createCell(columnId);
+      cell.setAttribute('part', `${columnId}-column`);
+      return cell;
     }
     const cell = this.createTD(columnId);
     cell.setAttribute('part', `${columnId}-column`);