[infra] Remove support for approvals from compare_results
[infra] Remove support for approvals from compare_results

Change-Id: I41d80e8d21da0e272c0410f6f1d1e943bf4ae2d8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152640
Reviewed-by: William Hesse <a821cddceae7dc400f272e3cb1a72f400f9fed6d@google.com>
Commit-Queue: Karl Klose <49bc0b76cffb0b10cd8c84f9cabc97a31ffe6343@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