Improve Submission CSV export functionality

[bickelj]

Is your feature request related to an existing functionality? Please describe.

Submission CSV export.

Describe the solution you'd like

Permit the download application data from the All Submissions page - as filtered by the user - as a CSV as file.

Initially, restrict permissions to Staff/Staff Admin.

Priority

• Low priority (annoying, would be nice to not see)

Affected roles

• Staff