Empty State should be full width by default

[christiemolloy]

When implementing the Empty State component in the MDC, I had to add a variant to make the empty state take up the width of its parent. To me this seemed like a bug, and by default, the empty state should take up 100% width of its parent.

[rachael-phillips]

Hey @christiemolloy I've seen this and will discuss with @tlabaj

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[tlabaj]

Closed by #3933