Cases T-424/25 to T-428/25 and T-439/25 to T-443/25: Judgment of the General Court of 1 July 2026 – KJ and Others v Europol (Civil service – Members of the temporary staff – Fixed-term contract – Europol decision concerning the extension of contractual relationships up to 10 years – Exclusion of contract staff who have already been renewed – Rejection of the request for an additional year of service – Plea of illegality – Equal treatment – Temporal application of the rules of substantive law – Legal certainty