80617 Migrate ios_add2app_life_cycle to null safety (team, cla: yes, waiting for tree to go green)

80619 Migrate ios_platform_view_tests to null safety (team, cla: yes, waiting for tree to go green)

80621 Migrate platform_interaction to null safety (team, cla: yes, waiting for tree to go green)

80622 Migrate release_smoke_test to null safety (team, cla: yes)

80624 Migrate dev/integration_tests/ui to null safety (team, cla: yes)

80625 Migrate dev/integration_tests/web to null safety (team, cla: yes, waiting for tree to go green)

80628 Migrate web_e2e_tests to null safety (team, cla: yes)