79469 Migrate build_info to null safety (a: null-safety, cla: yes, team, tool)

79479 [ Web ] Register service extensions with DDS, not DWDS (cla: yes, tool, waiting for tree to go green)

79481 Fix device_port_forwarder file name typo (cla: yes, team, tool, waiting for tree to go green)

79486 [flutter_releases] Flutter Stable 2.0.4 Framework Cherrypicks (a: tests, cla: yes, engine, f: cupertino, f: material design, framework, team, tool)

79500 Correct misspellings throughout the codebase (a: tests, cla: yes, f: cupertino, f: material design, framework, team, tool, waiting for tree to go green)