export collection-xls for specific submission definition

[floriangantner]

Is your feature request related to a problem? Please describe.
The current collection-export to xls uses the fields from the default submission process.

There might be cases where you want to export fields which are not in the default submission process, e.g. which are only shown to administrative purposes and curated/filled by administrators.

Describe the solution you'd like

• Additional process parameter for the collection-xls script containing the submission definition.

• This submission definition is than passed through all methods until DCInputsReader

  DSpace/dspace-api/src/main/java/org/dspace/app/util/DCInputsReader.java

  Line 868 in dd87296

  private List<String> getSubmissionFormMetadata(Collection collection, boolean group)

  to deliver the specific fields

• The list of (all) available submission-definitions for the collection might be shown in the newly introduced export-xls modal from the submissiondefinitions endpoint to improve the administrator the selection of the correct submission definition

Describe alternatives or workarounds you've considered
...

Additional context