d6f50f4fe Roll Skia from be1c99658979 to b7223e1269f2 (12 revisions) (flutter/engine#25794) (#81349)

All agents have been deleted and removing this entry with last few agent tasks that appear in the dashboard. And remove the test_manifest.dart as well.
Co-authored-by: yusufm <mohsinally@google.com>

This reverts commit 285b4751.