Austenem/CAT-824 fix spacing

[austenem]

Summary

Fixes margin issue for alert banners in the datasets section of the "Create New Workspace" dialog.

Design Documentation/Original Tickets

CAT-824 Jira ticket

Testing

Manually tested by visually inspecting workspace dialogs that have none, one, or two alert banners.

Screenshots/Video

Previous issue:

Updated banners:

Checklist

• [X] Code follows the project's coding standards
  • [X] Lint checks pass locally
  • [X] New CHANGELOG-your-feature-name-here.md is present in the root directory, describing the change(s) in full sentences.
• [ ] Unit tests covering the new feature have been added
• [X] All existing tests pass
• [X] Any relevant documentation in JIRA/Confluence has been updated to reflect the new feature
• [X] Any new functionalities have appropriate analytics functionalities added