fix: imported custom property type

[imaspen]

Imported custom properties currently default the type to null. This causes the state to then update with the real type value, which triggers a forced replacement. This fetches the type from the organization property schema and adds it on import.

Resolves #2639

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Before the change?

• An imported custom property resource's property_type is set to null, which causes the configuration to trigger a forced replacement of the resource.

After the change?

• The property type is fetched from the organisation schema and set correctly, preventing the resource replacement.

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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