22566 Reland: Remove the Window class now that it is no longer used. (cla: yes)

22567 Roll Skia from c634fc4a664c to 75c38f94efd6 (2 revisions) (cla: yes, waiting for tree to go green)

22568 [flutter_releases] Flutter 1.24.0-10.2.pre engine cherrypicks (cla: yes)

22569 [macOS] Isolate openGL rendering to FlutterOpenGLRenderer (affects: desktop, cla: yes, needs tests, platform-macos, waiting for tree to go green)

22570 Roll Skia from 75c38f94efd6 to 8f46ecc84fab (1 revision) (cla: yes, waiting for tree to go green)