Cleanup unused Java imports and unused variables


Pick-to: 6.12
Change-Id: Ib0afdb2cca4ac4f079e117531c8e7b3b7efa2d90
Reviewed-by: Moss Heim <moss.heim@qt.io>
commit081a18a1119aa66441c450205da077a9a2f482f5
parent52a4e43b1f0b26fe3feb9044b1c3aaed43d84849
authorAssam Boudjelthia <assam.boudjelthia@qt.io>
committerAssam Boudjelthia <assam.boudjelthia@qt.io>
commit timeWed, 24 Jun 2026 09:43:58 +0000