fix(TableHeader): remove sort announcement props as no needed and update aria-sort handling

[Bracciata]

Summary

Fix NVDA screen reader announcing sort state on every table row cell.

Problem:
NVDA was reading "Rule sorted ascending" (or similar) for every cell in a sortable column, not just the column header.

For example:
row 2 RuleRule sorted ascending column 1 link and elements...
row 3 RuleRule sorted ascending column 1 link All page content...

Root cause:
TableHeader rendered an Offscreen live region
(role="status" aria-live="polite") inside the sort <button>. Because it
was inside the button, screen readers included the announcement text in the
column header's accessible name. NVDA then repeated that name for every cell
in the column.

Fix:
Removed the Offscreen live region entirely. Sort state is now
communicated solely via the aria-sort attribute on <th>, which is the
standard ARIA mechanism and is well-supported in modern screen readers (NVDA, JAWS, VoiceOver).

Changes

• packages/react/src/components/Table/TableHeader.tsx — removed Offscreen
  live region from inside the sort button; marked sortAscendingAnnouncement
  and sortDescendingAnnouncement props as @deprecated for backwards compatibility

• packages/react/src/components/Table/index.test.tsx — updated three tests
  to assert on aria-sort attribute instead of the removed live region content

Before / After (NVDA)

Before:
row 2 RuleRule sorted ascending column 1 link ...
row 3 RuleRule sorted ascending column 1 link ...

After:
row 1 column 1 sorted ascending Rule button
row 2 First Name column 1 Frank
row 3 First Name column 1 Jimmy

Closes: Walnut #13951

[Copilot]

Pull request overview

Adjusts the Table sorting announcement behavior so the sort live-region text is not included in the column header’s accessible name (preventing repeated announcements across cells in some screen readers).

Changes:

• Moves the sort announcement live region out of the TableHeader render tree and into document.body.
• Updates existing Table sort tests to align with the new live-region placement.
• Adds a new test intended to ensure the announcement is not included in the header accessible name / table cells.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
packages/react/src/components/Table/TableHeader.tsx	Introduces a hook that appends an offscreen role="status" live region to document.body and updates its text as sort state changes.
packages/react/src/components/Table/index.test.tsx	Removes icon-location assertions tied to the old DOM structure and adds a new test asserting the live region is outside the header/table.

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Addressed

[chornonoh-vova]

Overall looks good, left a couple of minor comments for your consideration.

[denysfedorov]

LGTM! Just one small minor suggestion about contexts creation