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)

69155 Remove intl_translation dependency from gen_l10n integration test (a: internationalization, cla: yes, tool)

69382 [gen_l10n] Fix unintended use of raw string in generateString (a: internationalization, cla: yes, severe: regression, team, tool)

69445 Standardize dartdoc macro names (a: accessibility, a: internationalization, a: tests, cla: yes, f: cupertino, f: material design, framework, team, waiting for tree to go green)