fix(playwright): drop dead bulkSelectColumnConfig that duplicated data-test

Round-2 commit f14f393d1a wrapped antd's rowSelection checkboxes with
data-test="header-toggle-all" / "row-select-checkbox", but the older
bulkSelectColumnConfig in ListView.tsx was still being prepended as a
column. antd's Table consumed its Header function via mapColumns and
rendered the Checkbox inside <tbody> as a ghost row, producing a second
element with data-test="header-toggle-all" and breaking all bulk-select
Playwright tests with a strict-mode "resolved to 2 elements" error.

antd's rowSelection owns checkbox rendering; react-table's useRowSelect
tracks selection state via toggleRowSelected / toggleAllRowsSelected
without needing a dedicated column. Remove bulkSelectColumnConfig and
its plumbing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>