[Infra] Enable ASAN for GitHub Actions Linux/x64 builds.

[rturrado]

I am going to disable it temporarily because it is making GitHub Actions fail but, at the same time, I cannot reproduce the issue locally.

However, I have a possible hint on the source of the problems: I think it has to do with libc++, ABI compatibility breakages, and small string optimization. Why?

• I've seen tests run OK for clang/Debug, but fail for clang/Release (small string optimization may hit here).
• I'm pretty sure small string optimizations accross compilers are linked to ABI compatibility breakages.
• And I think there's some darkness regarding gtest and libc++.
• The tests failing were format_utils tests, where we work with small strings.
• If we don't compile tests, GitHub doesn't complain.
• If we don't compile with ASAN, GitHub doesn't complain.

Tests built with Clang, c++11, and libc++ fail to link?
Trouble building tests with Google Test, Clang, and libc++

[rturrado]

See QuTech-Delft/libqasm#203.