83855 Migrate iOS project migrations to null safety (team, tool, cla: yes, waiting for tree to go green, a: null-safety)

83862 Migrate a few tool libraries to null safety (team, tool, cla: yes, waiting for tree to go green, a: null-safety)

83894 migrate complex layout to null safety (team, a: accessibility, cla: yes, waiting for tree to go green, a: null-safety, tech-debt)

83956 Migrate application_package to null safety (team, tool, cla: yes, waiting for tree to go green, a: null-safety)

84011 Migrate vitool to null safety (team, cla: yes, a: null-safety, tech-debt)