Support for freetext values in submission for vocabulary controlled onebox and tag types

[jensvannerum]

References

• Fixes Unable to add freetext values with onebox or tag input types when field uses a vocabulary #2435
• Requires Fix an issue where the closed attribute of vocabularies in the submission forms would be neglected DSpace#9181

Description

This PR adds support for adding custom input in submission fields that are controlled by a vocabulary

Instructions for Reviewers

List of changes in this PR:

• Altered the VocabularyTreeviewComponent class and html template to show an "Add" (i18n message) button. This button is disabled if the vocabulary is closed, or if no text is given.
• Altered the DynamicTagComponent class so that custom user input is supported. If results are present from the vocabulary autofill, the custom user input is appended to the bottom of the list, this is done since a value from the vocabulary is preferred.

An in-depth "how-to-test" guide is included in the back end PR as these PR's can not be tested separately

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[alanorth]

Thanks @jensvannerum! I tested this patch on DSpace 7.6 with onebox and tag input types and it allows me to specify freetext values on fields that use controlled vocabularies. I also tested to make sure vocabularies with closed="false" (default) and closed="true" worked as expected.

[dspace-bot]

Successfully created backport PR for dspace-7_x:

• [Port dspace-7_x] Support for freetext values in submission for vocabulary controlled onebox and tag types #2615