[Feature Request]: Generate report about ci jobs once ci completed

### Description of new feature

If you look at llvm, it comments on a PR if jobs fail. It would be nice for CppInterOp to provide a report on PRs upon sucess.

e.g. the report could include

`
os
How fail cppyy tests are passing/failing/xpassing/xfailing
In the case of xpass, provide a list of tests which unexpectedly passed (should help with updating tags)
`