use authority instead of value for type-bind

[philippcle]

In the current version of DSpace-CRIS-7, it is not possible to store values in MD fields that are associated with type-bind. This is because the validate method in MetadataValidator.java uses the value of DocumentType, but in DSpace-CRIS-7 the DocumentType is controlled by the controlled-vocabulary publication-coar-types. Therefore, the validate method must use the authority of the DocumentType.

[saschaszott]

This issue affects at least DS CRIS 2023.01 and 2022.03.

[philippcle]

The issue that empty MD fields with the required-property are accepted when these fields are associated with a type-bind is also fixed by this PR.

[philippcle]

It is important to point out that the problem only occurs if you have implemented the type bind using the COAR vocabulary.

[github-actions]

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[saschaszott]

Has the problem been fixed in the meantime?