feat(ui-markdown-editor): update tables

[TC5022]

Signed-off-by: TC5022 tanyac5022002@gmail.com

This PR updates the markdown-UI editor to incorporate the recent changes made by this commit.

Changes

• a user can now easily copy and paste tables
• tables with and without headers are functional

Author Checklist

• [ ] Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• [ ] Vital features and changes captured in unit and/or integration tests
• [ ] Commits messages follow AP format
• [ ] Extend the documentation, if necessary
• [ ] Merging to master from fork:branchname
• [ ] Manual accessibility test performed
  • [ ] Keyboard-only access, including forms
  • [ ] Contrast at least WCAG Level A
  • [ ] Appropriate labels, alt text, and instructions