Case C-288/21 P: Judgment of the Court (Sixth Chamber) of 22 December 2022 — Universität Koblenz-Landau v European Education and Culture Executive Agency (EACEA) (Appeal — Arbitration clause — Tempus IV Programmes — Grant agreements Ecesis, Diusas and Deque — Systemic and recurrent irregularities — Request for full repayment of the amounts paid — Right to be heard — Principle of proportionality — Principle of the protection of legitimate expectations — Application to reopen the oral part of the procedure at first instance — Article 113(2)(c) of the Rules of Procedure of the General Court)