Roll Observatory packages and add a roll script

intl/lib/src/data/dates/locale_list.dart

Index: intl/lib/src/data/dates/locale_list.dart
diff --git a/intl/lib/src/data/dates/locale_list.dart b/intl/lib/src/data/dates/locale_list.dart
deleted file mode 100644
index 2c55f289a4c8e0f77d713ca914eef6dcf08ccf55..0000000000000000000000000000000000000000
--- a/intl/lib/src/data/dates/locale_list.dart
+++ /dev/null
@@ -1,108 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this sourcecode is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/// Hard-coded list of all available locales for dates.
-final availableLocalesForDateFormatting = const [
-  "en_ISO",
-  "af",
-  "am",
-  "ar",
-  "az",
-  "bg",
-  "bn",
-  "br",
-  "ca",
-  "chr",
-  "cs",
-  "cy",
-  "da",
-  "de",
-  "de_AT",
-  "de_CH",
-  "el",
-  "en",
-  "en_AU",
-  "en_GB",
-  "en_IE",
-  "en_IN",
-  "en_SG",
-  "en_US",
-  "en_ZA",
-  "es",
-  "es_419",
-  "es_ES",
-  "et",
-  "eu",
-  "fa",
-  "fi",
-  "fil",
-  "fr",
-  "fr_CA",
-  "gl",
-  "gsw",
-  "gu",
-  "haw",
-  "he",
-  "hi",
-  "hr",
-  "hu",
-  "hy",
-  "id",
-  "in",
-  "is",
-  "it",
-  "iw",
-  "ja",
-  "ka",
-  "kk",
-  "km",
-  "kn",
-  "ko",
-  "ky",
-  "ln",
-  "lo",
-  "lt",
-  "lv",
-  "mk",
-  "ml",
-  "mn",
-  "mr",
-  "ms",
-  "mt",
-  "my",
-  "nb",
-  "ne",
-  "nl",
-  "no",
-  "no_NO",
-  "or",
-  "pa",
-  "pl",
-  "pt",
-  "pt_BR",
-  "pt_PT",
-  "ro",
-  "ru",
-  "si",
-  "sk",
-  "sl",
-  "sq",
-  "sr",
-  "sv",
-  "sw",
-  "ta",
-  "te",
-  "th",
-  "tl",
-  "tr",
-  "uk",
-  "ur",
-  "uz",
-  "vi",
-  "zh",
-  "zh_CN",
-  "zh_HK",
-  "zh_TW",
-  "zu"
-];