[analyzer][AnalysisOrderChecker] Display the CallEvent type in preCall/postCall

Exactly what it says on the tin! The included testfile demonstrates why this is
important -- for C++ dynamic memory operators, we don't always recognize custom,
or even standard-specified new/delete operators as CXXAllocatorCall or
CXXDeallocatorCall.

Differential Revision: https://reviews.llvm.org/D77391