59709 Clean up PollingDeviceDiscovery dispose (cla: yes, tool, waiting for tree to go green)

59714 Use a HeaderBar for Linux applications. (cla: yes, tool)

59717 Manual engine roll to update format of compileExpression RPC response (cla: yes, engine, tool, waiting for tree to go green)

59773 [flutter_tools] add missing null-safety flags (cla: yes, tool)

59774 Revert “Manual engine roll to update format of compileExpression RP… (cla: yes, engine, tool)

59786 [flutter_tools] make parent logger optional (cla: yes, tool)

59789 Make flutter and dart scripts invoke their batch file equivalents on Windows (cla: yes, tool)

59802 Remove Linux shell window_configuration.cc (cla: yes, tool)