[9.x] BelongsToMany firstOrCreate and firstOrNew should merge attributes correctly
#38367
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This PR is related to #38346 but only targets the
9.0branch as thefirstOrNew()andfirstOrCreate()methods on theBelongsToManyrelationship were updated in9.0(#37337) to be functionally the same as the equivalent methods inBuilderandHasOneOrManyclasses.