fix: remove duplicate targetModelClassName import in has-one relation…

[aaqilniz]

One of my PR introduced a bug in relation generation (Here is the commit). Generating a hasOne relation resulted in a duplicate import of targetModelClassName in the has-one relation template file.

This PR fixes that by removing the duplication.

Checklist

• [x] DCO (Developer Certificate of Origin) signed in all commits
• [ ] npm test passes on your machine
• [ ] New tests added or existing tests modified to cover all changes
• [ ] Code conforms with the style guide
• [ ] API Documentation in code was updated
• [ ] Documentation in /docs/site was updated
• [x] Affected artifact templates in packages/cli were updated
• [ ] Affected example projects in examples/* were updated

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