Bug - Table - accessibility rules have changed, all thead cells should be <th>s

Describe the problem
Accessibility rules have changed, <td>s in theads are no longer acceptable.

How do you reproduce the problem?
Test with lighthouse, other accessibility tools, and/or screen reader

Expected behavior
Columns are described clearly and concisely with text and without altering table layout

Is this issue blocking you?

Replace all thead > tds (blank visually) to <th><span class="pf-v5-screen-reader">{descriptive text}{/span></th>
For non-text content (select all checkbox, expand all buttons), <th aria-label="Row check">{interactive element such as input or button with its own aria-label}</th>
Update :empty table cell styling to be something like

:is(.pf-v5-c-table__th, .pf-v5-c-table__td) {
  &:has(.pf-v5-screen-reader),
  &:empty {
    width: auto
    min-width: auto;
    padding: 0;
  }
}

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