Add decision to remove link restrictions between work item types

Daniyal Arshadrequested to merge
da-linked-item-restriction-decision-registry-update into main

Description

Based on this discussion here gitlab-org/gitlab#581932 (comment 3019673313), we decided to remove link restrictions between work item types. This MR updates the decision registry to record this decision in the design doc.

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Edited by Daniyal Arshad

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