Mark current unreleased version in api reference

[kadewu]

Currently we generate api reference based on Graphql schema. Doing so we end up with Graphql objects/fields that are yet not in lastest official release of Saleor.
Each such occurrence have added label ADDED_IN_X - which can be confusing for our users when identifying such version.

Internal discussion: https://saleorcommerce.slack.com/archives/C038R4ATU0N/p1733768719756139

Example proposition to address the issue:

• Consider adding a note to said label for unreleased version to avoid confusion.
• Make sure to have knowledge which changes are not yet released.