fix keyboard nav for home page

[aalves08]

Summary

Fixes #12776

Occurred changes and/or fixed issues

• Fix keyboard navigation on home page
• checkbox is now visibly focusable
• Banner component has correct roles, labels and is focusable
• SortableTable component has been fixed for basic keyboard nav (sorting, checkboxes, links, open/close row action menu)

Technical notes summary

Areas or cases that should be tested

• Go to the home page and browse the page with the tab key
• use enter or space key to trigger UI elements on the page

Areas which could experience regressions

Screenshot/Video

Screen.Recording.2025-01-02.at.16.23.48.mov

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[rak-phillip]

This looks good. I think all the comments I left are fairly minor and have been addressed in other open accessibility PRs.