78823 Update Podfile.lock modified timestamp when pod install is run (cla: yes, platform-ios, tool, waiting for tree to go green)

78824 Record deferred components assets in AssetManifest.json (cla: yes, tool, waiting for tree to go green)

78836 Make version and time in flutter_tool null safe (a: null-safety, cla: yes, team, tool)

78843 Make language_version in flutter_tool null safe (a: null-safety, cla: yes, team, tool)

78845 Migrate flutter_tool tool helper files to null safety (a: null-safety, cla: yes, team, tool)

78885 Exclude CI from tool root check (cla: yes, team, tool)