Remove BoxWithFallback usage and sx prop from DataTable.Container

[mperrotti]

Relates to https://github.com/github/primer/issues/5424

Changelog

New

Changed

Removes sx prop from DataTable.Container

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: e19f345

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Major
@primer/styled-react	Major

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[Copilot]

Pull Request Overview

This PR removes the sx prop support from DataTable.Container as part of a larger effort to modernize the component architecture. The change replaces BoxWithFallback usage with a modern polymorphic component pattern.

• Removes sx prop and BoxWithFallback dependency from DataTable.Container
• Implements modern polymorphic component pattern with PolymorphicProps
• Updates type definitions to support generic as prop for element customization

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/react/src/DataTable/Table.tsx	Removes sx prop support, replaces BoxWithFallback with polymorphic component pattern
.changeset/fruity-monkeys-cover.md	Documents breaking change for major version release

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/3735

[primer-integration]

🟢 ci completed with status success.