29734 Fix some clang-tidy lints for Linux host_debug (platform-android, cla: yes, waiting for tree to go green, platform-linux, embedder)

29741 Add ‘explicit’ to header files (platform-android, cla: yes, needs tests, embedder)

29775 Opacity peephole optimization (platform-ios, platform-android, cla: yes, waiting for tree to go green, needs tests, embedder)

29795 [Embedder] Send key data through message channel (platform-ios, cla: yes, platform-fuchsia, embedder)

29800 Listen for display refresh changes and report them correctly (platform-ios, platform-android, cla: yes, waiting for tree to go green, embedder)

29831  Remove the dart entry point args from the Settings struct (cla: yes, waiting for tree to go green, platform-fuchsia, embedder)