Stop using `contain: paint;` on tables

[Jeremy-Walton]

Describe the bug

Table uses contain: paint which causes issues with tooltips or other pop-over content. It acts similarly to overflow hidden. It was added to fix an issue with the background color on the header not matching the radius, but there are other approaches to fix it.

To Reproduce
Steps to reproduce the behavior:

1. Use a table with the .table class
2. Have a tooltip in a cell on the edge of the table
3. See that it gets cut off