Fix large table horizontal scroll and prevent side-by-side tables

What does this MR do?

This pull-request fixes 2 know issues:

1. #51731 (closed)
   A wiki table written right after another table is displayed next to it rather than on a new line

2. #44014 (closed)
   Large tables in wikis overflow on the right rather than displaying an horizontal scroll bar

For #51731 (closed), the fix is to use display: block for markdown tables in general, rather than only when @supports (width: fit-content) passes, which would result to a display: inline-block.

For #44014 (closed), the use of width: fit-content is removed since it seems to nullify overflow-x: auto.

What are the relevant issue numbers?

• #51731 (closed)
• closes #44014 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer