25745 [fuchsia] Adds a singleton to access inspect root node. (cla: yes, platform-fuchsia)

25750 [fuchsia] Remove now unsed wrapper for zx_clock_get (cla: yes, waiting for tree to go green, platform-fuchsia)

25785 [Engine] Support for Android Fullscreen Modes (platform-ios, platform-android, cla: yes, waiting for tree to go green, platform-fuchsia)

25789 Pause dart microtasks while UI thread is processing frame workloads (platform-ios, cla: yes, platform-fuchsia)

25843 [flutter_releases] Flutter Stable 2.0.6 Engine Cherrypicks (platform-ios, platform-android, cla: yes, platform-web, platform-macos, platform-linux, platform-windows, platform-fuchsia, embedder)