[Debugger] OnInsertBreakEvent() always needs to return a BreakEventInfo
[Debugger] OnInsertBreakEvent() always needs to return a BreakEventInfo

Fixes bug #11636

joj/debugger-libs,mono/debugger-libs,joj/debugger-libs,mono/debugger-libs,Unity-Technologies/debugger-libs,Unity-Technologies/debugger-libs