[technical debt] Remove explicit default columns when creating EntityView in curation tests

[linglp]

Problem

The folder_with_view fixtures in test_curation_async.py explicitly specified all default EntityView columns when constructing an EntityView. These columns are already included by default — passing them explicitly adds noise without any behavioral difference.

Solution

Remove the explicit columns list and the columns=columns argument from all four folder_with_view fixtures. The tests are functionally identical but simpler to read.

[Copilot]

Pull request overview

This PR simplifies the async curation integration tests by removing explicit default EntityView column definitions in folder_with_view fixtures, relying on Synapse’s built-in default view columns behavior instead.

Changes:

• Removed explicit columns lists (default view columns) from four folder_with_view fixtures.
• Dropped now-unused Column and ColumnType imports.

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