Describe the need

Currently data and resource use properties (plural) in the naming, but in reality both work only with a single property.

To follow the naming of other resources and properties naming should be changed to property (singular).

Resource organization_custom_properties
Data organization_custom_properties
both use attribute property_name which is only a single one and both can't work with more than a single custom property.

It probably the use case when data and resource should be renamed to organization_custom_property (singular),
plurals need to be marked as deprecated within version v6 of provider and probably removed in v7.

SDK Version

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API Version

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