54176 Fix newly reported prefer_const_constructors lints. (a: internationalization, cla: yes, d: examples, team, tool)

54219 Remove escape dollar parameter in localizations_utils (a: internationalization, cla: yes, team, waiting for tree to go green)

54314 [gen_l10n] Expand integration tests (a: internationalization, cla: yes, tool, waiting for tree to go green)

54401 Cleanup in gen_l10n files (a: internationalization, cla: yes, team)

55336 Adding tabSemanticsLabel to CupertinoLocalizations (a: accessibility, a: internationalization, cla: yes, f: cupertino, framework, severe: API break, team, waiting for tree to go green)

55792 [gen_l10n] Output directory option (a: internationalization, cla: yes, team)