55909 [gen_l10n] Fix unintended breaking change introduced by output-dir option (a: internationalization, cla: yes, team, tool)

56090 Step 1 of 3: Add opt-in for debugCheckHasMaterialLocalizations assertion on TextField (a: internationalization, a: text input, cla: yes, f: material design, framework, waiting for tree to go green)

56091 Ensure *_kn.arb files are properly escaped with gen_localizations (a: internationalization, cla: yes, f: cupertino, f: material design, framework)

56146 Fixed a typo, gen_l10n_types.dart comment (a: internationalization, cla: yes, tool, waiting for tree to go green)

56373 [gen_l10n] Improve arb FormatException error message (a: internationalization, cla: yes, tool, waiting for tree to go green)