views: FAIR signposting level 1 support & remove linkset link to itself

[ptamarit]

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Description

• Partially fixes FAIR signposting level 1 support (HTTP Link headers & link rel item) invenio-app-rdm#2937
• Required for views: FAIR signposting level 1 support (HTTP Link headers) invenio-app-rdm#2938
• See description in linked ticket

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