Werk #12941: REST API: convert known host attributes to well defined structure

Previously the outbound structure of host and folder attributes was not defined. The internal structure of the values were directly passed through. This was confusing because the inbound structure of these attributes was already defined, leading to 2 distinct structures of the same thing.

This is no longer the case. This werk introduces documentation and validation/conversion of outbound host and folder attributes.

Some attribute values may now be different due to this change. Please check your scripts.

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