86808 Remove unused build_mode_test (a: tests, team, cla: yes, waiting for tree to go green, tech-debt)

86812 Remove unused flutter_gallery_instrumentation_test (team, cla: yes, waiting for tree to go green, tech-debt)

86819 [flutter_release] Cherrypicks flutter 2.4 candidate.4 (team, cla: yes)

86822 Remove unused tiles_scroll_perf_iphonexs__timeline_summary (a: tests, team, cla: yes, waiting for tree to go green, tech-debt)

86826 Remove obsolete plugin_test_win (a: tests, team, cla: yes, waiting for tree to go green, tech-debt)