BC: Removing `incomplete_` prefix in compositions.aggregate

https://cyclonedx.org/docs/1.5/json/#compositions_items_aggregate

We currently have `incomplete_` prefix on values. This sounds negative and could confuse the consumers that the list is incomplete.

For example, the vendor might have provided a complete and accurate first-party-only or third-party-only SBOM as per the compliance requirements.

It will be nice to accept values without the `incomplete_` prefix.