Ignore todos in DDC

These aren't useful to see cluttering up diagnostic lists - they can be
found easily enough in other ways.

Change-Id: I34b800c1145ae476822afddff558d62c4ffb9b2f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103141
Reviewed-by: Mark Zhou <markzipan@google.com>
diff --git a/pkg/dev_compiler/analysis_options.yaml b/pkg/dev_compiler/analysis_options.yaml
index 3d92c04..0fdf6da 100644
--- a/pkg/dev_compiler/analysis_options.yaml
+++ b/pkg/dev_compiler/analysis_options.yaml
@@ -1,4 +1,6 @@
 analyzer:
+  errors:
+    todo: ignore
   exclude:
     - doc/api/**
     - gen/**