fix(DataTable): add position relative to prevent jumping

[tw15egan]

Closes #9403

Adds position: relative to prevent jumping when a checkbox is checked in a scrollable div.

Changelog

New

• position: relative to data table

Testing / Reviewing

Check out https://codesandbox.io/s/adoring-sound-cvryv?file=/index.html and add position: relative to .bx--data-table-container. Scroll down and check a checkbox, the page shouldn't jump.

Ensure all data table variants remain unchanged.

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[dakahn]

Works for me! 🏄🏾