Export multi-valued fields into single columns

[bkiahstroud]

Summary

Multi-valued fields should be exported into single columns instead of split into numerated ones

Before:

title_1	title_2
First Title	Second Title

After:

title
First Title; Second Title

Testing Instructions

1. Login as an admin
2. Navigate to Dashboard > Importers > New
3. Fill out required fields. Upload a CSV that has multiple values for all properties that accept multiple values
4. Click "Create and Import"
5. Navigate to the importer's show page. After a couple minutes, refresh the page and ensure the entries succeeded
6. Navigate to Dashboard > Exporters > New
7. Select "Export From" > "Importer". Select the importer under "Importer". Fill out required fields. Click "Create and Export"
8. After a couple minutes, refresh the page and click the download icon next to the exporter
9. Open the downloaded CSV. Verify that the exported CSV satisfies the Acceptance Criteria

Acceptance Criteria

• [ ] All properties that accept multiple values should export their values in a single column
• [ ] Multiple values are joined by the pipe (|) character (requires https://github.com/UCSCLibrary/ucsc-library-digital-collections/pull/267)

[snehagunduraoUL]

This works as expected. This ticket can be closed.