Translating GraphQL input for a model with a has-many creates `null` value (incorrectly)

[lawmicha]

bug where collections's are being set to nil in the GraphQL input, so for example, when creating a Post and saving it through DataStore. the sync process will translate the post to the GraphQL input variables containing

{
  "id": "postid123",
   "comments": null
}

The problem is this fails as there's no input type "comments". We should skip has-many relationships like in this code snippet. This can be done in main and v1

Originally posted by @lawmicha in #2448 (comment)

[github-actions]

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[lawmicha]

this was fixed in #2661