enable provide_deprecation_message (#77106)

analysis_options.yaml

diff --git a/analysis_options.yaml b/analysis_options.yaml
index 30c9dd5..8c7481e 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -181,7 +181,7 @@
     - prefer_spread_collections
     - prefer_typing_uninitialized_variables
     - prefer_void_to_null
-    # - provide_deprecation_message # not yet tested
+    - provide_deprecation_message
     # - public_member_api_docs # enabled on a case-by-case basis; see e.g. packages/analysis_options.yaml
     - recursive_getters
     # - sized_box_for_whitespace # not yet tested

dev/bots/test/analyze-test-input/root/packages/foo/deprecation.dart

diff --git a/dev/bots/test/analyze-test-input/root/packages/foo/deprecation.dart b/dev/bots/test/analyze-test-input/root/packages/foo/deprecation.dart
index b2e83c8..9d74f5b 100644
--- a/dev/bots/test/analyze-test-input/root/packages/foo/deprecation.dart
+++ b/dev/bots/test/analyze-test-input/root/packages/foo/deprecation.dart
@@ -26,7 +26,7 @@
 )
 void test4() { }
 
-@deprecated // no message
+@deprecated // ignore: provide_deprecation_message
 void test5() { }
 
 @Deprecated('Not the right syntax. This feature was deprecated after v1.2.3.')