fix(utils/dml): set-relationship graphql generator from DML wrong managed belongsTo (#9932)

**What**
Currently, when setting a `belongsTo` relationship on the DML with the otherside being `hasMany` it result in a wrongly generated gql output making the belongs to being a collection of the relation instead of the relation directly. This pr fixes this issue

.changeset/tame-sloths-pump.md

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+---
+"@medusajs/utils": patch
+---
+
+fix(utils/dml): set-relationship graphql generator from DML wrong managed belongsTo