intl: Adjust METADATA and fix some execute permissions

* Use `PIPER` instead of `LOCAL_SOURCE` to avoid the need for
  `last_upgrade_date`.
* Remove unnecessary execute permissions from files not meant to be
  directly executed.

PiperOrigin-RevId: 309978637
diff --git a/test/compact_number_test_data.dart b/test/compact_number_test_data.dart
old mode 100755
new mode 100644
diff --git a/test/compact_number_test_data_33.dart b/test/compact_number_test_data_33.dart
old mode 100755
new mode 100644
diff --git a/test/locale_test_data.dart b/test/locale_test_data.dart
old mode 100755
new mode 100644