Re-enable BrunelCache under sanitizer builds

Whilst developing the sanitizer builds at first I had issues with the BrunelCache builds, that lead me to disable them under the sanitizers in !503 (merged).

Since then I have improved things, and it is no longer an issue to build the BrunelCache for the sanitizer builds, and in fact skipping it causes a few other issues with some tests (that test the cache). So this MR re-enabled it again for these builds.