92022 Bump Android Compile SDK to 31 (team, tool, cla: yes, waiting for tree to go green, integration_test)

92049 Reland “Add multidex flag and automatic multidex support (#90944)”  (tool, cla: yes)

92052 Bump Kotlin version in templates and projects (team, tool, a: accessibility, cla: yes, d: examples, waiting for tree to go green, integration_test)

92055 Migrate desktop_device to null safety (tool, cla: yes, waiting for tree to go green, a: null-safety, tech-debt)

92056 Migrate xcdevice and ios devices to null safety (tool, cla: yes, waiting for tree to go green, a: null-safety, tech-debt)