28937 Cherry-pick #28846 and #28743 into flutter-2.6-candidate.11 (platform-ios, platform-android, cla: yes, needs tests, embedder)

28938 fixed android unit tests (rotted before CI is running) (platform-android, cla: yes, waiting for tree to go green)

28939 Roll Skia from 31a94580b700 to 501e8e1a2c9f (5 revisions) (cla: yes, waiting for tree to go green)

28940 [flutter_releases] Flutter stable 2.5.2 Engine Cherrypicks (cla: yes)

28941 Roll Skia from 501e8e1a2c9f to d034db791d67 (2 revisions) (cla: yes, waiting for tree to go green)