Apply correct markup to selected breadcrumb items

[rezrah]

Summary

Fixes #819

Changes the markup applied to selected breadcrumb items to be a non-interactive element. This removes tab focus from these items, making them inaccessible via keyboard navigation.

🔗 Preview

List of notable changes:

• Updated tests
• Updated markup rendering

Steps to test:

1. Verify tests cover the branching logic adequately

Contributor checklist:

• All new and existing CI checks pass
• Tests prove that the feature works and covers both happy and unhappy paths
• Any drop in coverage, breaking changes or regressions have been documented above
• UI Changes contain new visual snapshots (generated by adding update snapshots label to the PR)
• All developer debugging and non-functional logging has been removed
• Related issues have been referenced in the PR description

Reviewer checklist:

• Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• Check that tests prove the feature works and covers both happy and unhappy paths
• Check that there aren't other open Pull Requests for the same update/change

Screenshots:

Before:

Screen.Recording.2024-11-14.at.9.41.02.AM.mov

After:

Screen.Recording.2024-11-26.at.14.10.41.mov

[changeset-bot]

🦋 Changeset detected

Latest commit: 338172c

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

This PR includes changesets to release 6 packages

Name	Type
@primer/react-brand	Patch
@primer/brand-primitives	Patch
@primer/brand-e2e	Patch
@primer/brand-fonts	Patch
@primer/brand-config	Patch
@primer/brand-storybook	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🟢 No design token changes found

[github-actions]

⚠️ Visual differences found

Our visual comparison tests found UI differences.

Please review the differences by using the test artifacts to ensure that the changes were intentional.

Artifacts can be downloaded and reviewed locally.

Download links are available at the bottom of the workflow summary screen.

Example:

If the changes are expected, please run npm run test:visual:update-snapshots to replace the previous fixtures.

Review visual differences

[joshfarrant]

Looks good! A couple of tiny things but happy to approve as neither are required changes