Fix markdown table showing extra fake column v1

What does this MR do?

• Revert changes in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16527
• Add the same overflow rules that the notes content parent(.note-body) has to get around this.
  • This results in the whole note horizontally scrolling but is how we previously dealt with this situation.

There is also an alternative solution, v2 https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17670, where we collapse the width and remove the doubled borders

Before	After

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Closes #44024 (closed)