Remove the ignore for the top level .packages file.
Remove the ignore for the top level .packages file.

Change-Id: Iab05d3658f802615c3cfa6ed921ca7296e8343f0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249726
Reviewed-by: Kevin Moore <1d6e7d10d051cf619c5282da3c28fd8d3e0a65a4@google.com>
Commit-Queue: Devon Carew <e996497f4f2225f0ee7a9f4d1696ee710b488b66@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk