[Local GC] Fix a number of handle table interface violations (#12277)

[Local GC] Fix a number of handle table interface violations (#12277)

* Fix a smattering of GC handle table interface violations

Stub out a few other handle violations

* [Local GC] Add SetExtraInfoForHandle onto GC handle manager interface

* [Local GC] Changes uses of HndGetHandleADIndex to GetHandleContext

* Add HandleGetType to GC handle table interface

1) Change IGCHandleManager methods that take "int" to represent the type of a handle to HandleType, and fix callers to cast to HandleType
2) Add HandleFetchType to IGCHandleManager, returning a HandleType
3) Fix uses of handtablepriv's HandleFetchType and remove the GC directory from the include path

* 9 -> HNDTYPE_WEAK_WINRT, 0 -> HNDTYPE_WEAK_SHORT in assert