Use default column background color for board new list
What does this MR do and why?
This removes some custom styling to default new lists on the Boards pages (Issue & Epic) to utilize the default background color (gray-50).
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Screenshots or screen recordings
| State | Before | After |
|---|---|---|
| New list (updated bg) |  |
 |
| Board column (unchanged) |  |
 |
| Swimlanes (unchanged) |  |
 |
How to set up and validate locally
- Go to a Boards page (Issue Boards or Epic Boards)
- Click the "Create list" button
- Verify the new list background is using
gray-50(like other lists)
Edited by Nick Brandt