Some cleanups in Native AOT suspension area (#69885)

Some cleanups in Native AOT suspension area (#69885)

* some renames

* strongly typed transition frames

* remove remaining pieces of LoopHijack

* comments and some refactoring

* IsManaged

* removed m_CodeManagerList

* m_ModuleListLock

* better comment for a SafeHandle hack

* Renamed SetupHackPInvokeTunnel  (to not have "hack in the name)

* made IsInForbidBlockingRegion a debug-only assert

* removed ForbidBlockingHolder

* remove forbidBlocking tracking. It only affects 4 methods.

* Fix Unix build

* typo

* record managed code range in RuntimeInstance.