Remove import columns from projects table

In https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21497, we
migrated all project import data into a separate table,
`project_import_data`.  In addition, we also added:

```
ignore_column :import_status, :import_jid, :import_error
```

In https://gitlab.com/gitlab-com/gl-infra/production/issues/908, we
observed some of these `import_error` columns consumed megabytes of
error backtraces and caused slow loading of projects whenever a `SELECT
* from projects` query loaded the row into memory.

Since we have long migrated away from these columns, we can now drop
these columns entirely.

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/lib/gitlab/database/migration_helpers_spec.rb b/spec/lib/gitlab/database/migration_helpers_spec.rb
index 1e4c4c38f74..3cf3d032bf4 100644
--- a/spec/lib/gitlab/database/migration_helpers_spec.rb
+++ b/spec/lib/gitlab/database/migration_helpers_spec.rb
@@ -461,9 +461,9 @@ describe Gitlab::Database::MigrationHelpers do
       end
 
       it 'updates all the rows in a table' do
-        model.update_column_in_batches(:projects, :import_error, 'foo')
+        model.update_column_in_batches(:projects, :description_html, 'foo')
 
-        expect(Project.where(import_error: 'foo').count).to eq(5)
+        expect(Project.where(description_html: 'foo').count).to eq(5)
       end
 
       it 'updates boolean values correctly' do