69005 Fix null issue with dynamically updating from zero tabs for TabBar (a: null-safety, cla: yes, f: material design, framework, waiting for tree to go green)

69025 Reland: enable unnecessary_string_escapes and use_raw_strings (#68302) (a: internationalization, a: tests, cla: yes, f: cupertino, f: material design, framework, team, tool, waiting for tree to go green)

69046 Print errors in all build modes (cla: yes, framework, team, waiting for tree to go green)

69050 InheritedTheme updates (cla: yes, f: material design, framework, waiting for tree to go green)

69055 Make WidgetsLocalizations.of non-nullable (cla: yes, framework)