28334 Fix typo in a comment in #28098 (cla: yes, waiting for tree to go green, platform-windows, needs tests)

28355 fuchsia: Fix renderer destructor (cla: yes, platform-fuchsia, needs tests)

28407 fuchsia: Fix MissingPluginException being thrown in Dart from platform_view.cc (platform-ios, platform-android, cla: yes, platform-web, platform-macos, platform-linux, platform-windows, platform-fuchsia, needs tests, embedder)

28514 RTM must acquire lock before called IsMergedUnsafe (cla: yes, needs tests)

28533 Revert “RTM must to acquire lock before called IsMergedUnsafe (#28514)” (cla: yes, needs tests)

28573 Linux mock interfaces (cla: yes, platform-linux, needs tests)