Run the hardened_malloc testsuite in the CI

[hardened_malloc]( https://github.com/GrapheneOS/hardened_malloc ) has a really nice [testsuite](https://github.com/GrapheneOS/hardened_malloc/tree/main/test/simple-memory-corruption ) of memory corruptions that isoalloc should be able to detect. It would be nice to run it as part of the CI, to prove that isoalloc can effectively detect them as well.