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)

69027 Roll Engine from e2c375084d08 to 42b3b0af6340 (5 revisions) (cla: yes, waiting for tree to go green)

69032 Roll Engine from 42b3b0af6340 to 1857470267f1 (1 revision) (cla: yes, waiting for tree to go green)

69033 [flutter_tools] update test platform to use buildInfo instead of mode + additional params (cla: yes, tool)