WIP: Abstract html tables into separate components

What does this MR do?

Refactor MR diffs to separate HTML tables from the display components.

Moving off of HTML tables is the first step to enabling draggable selection for multiline comments and several performance improvements.

The idea here is to move all of the HTML table markup out of the lower elements like div-table-cell so that we can reuse their logic as unchanged as possible in a non-table markup layout.

Screenshots

n/a

Does this MR meet the acceptance criteria?

Conformity

• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.