8987 add observatoryUrl property to FlutterEngine (cla: yes)

8990 Minor fixes/adjustments to the GLFW shell (cla: yes)

8991 Enable hover by default for desktop shells (cla: yes)

8996 Roll Buildroot (cla: yes)

8998 [fuchsia] Update zx_clock_get callers (cla: yes)

8999 Do nothing if the params didn’t change when compositing platform views. (cla: yes)

9003 Rename Fuchsia Dart and Flutter runners (cla: yes)

9019 Macos systemnavigator pop (cla: yes)

9020 Remove m prefix from fields in the Android PlatformViews code (cla: yes)

9022 Fix horizontal scroll direction for macOS (cla: yes)