DEICH-6304 change mapping of subjects with 600$t

Merged Petter Goksøyr Åsen requested to merge DEICH-6304 into master

Previously this was mapped to a contribution on work, but now it is mapped to a person as subject of work, plus work with mainentry person as subject of work.

In addition, this commit also fixes automatic mapping of existing persons as subject using bibsysId during catalouging in Fuge.

Closes DEICH-6304

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