Prevent Epics Tree from being draggable when user is logged out

What does this MR do?

This MR fixes couple of bugs around Epics tree;

• Prevent Epics Tree from being draggable when user is logged out.
• Fix list item padding when user is logged out.
• Fix list item metadata alignment on smaller screens.

Does this MR meet the acceptance criteria?

Conformity

• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

#34244 (closed)