Grid, cloud, and cluster computing; quantum technologies; and modeling, simulation and visualization methods: 20th international conference, gcc 2024, third international conference, iceqt 2024, and 21st international conference, msv 2024, held as part of the world congress in computer science, computer engineering and applied computing, csce 2024, las vegas, nv, usa, july 22–25, 2024, revised selected papers