91309 Migrate assets, common, icon_tree_shaker to null safety (tool, cla: yes, a: null-safety, tech-debt)

91443 Reland Remove autovalidate deprecations (a: text input, team, framework, f: material design, severe: API break, cla: yes, waiting for tree to go green, tech-debt)

91455 Migrate android build target to null safety (tool, cla: yes, waiting for tree to go green, a: null-safety, tech-debt)

91457 Move DeviceManager into null migrated globals library (tool, cla: yes, a: null-safety, tech-debt)

91516 Migrate crash_reporting and github_template (tool, cla: yes, waiting for tree to go green, a: null-safety, tech-debt)