[libc++][sanitizers][arm] Setup libc++ CI with Arm sanitizers

[vitalybuka]

HWAsan is interesting in particular, as the others covered by x86 bots as well.

#130145 (comment)

[vitalybuka]

I assume there is something need to be added into
https://github.com/llvm/llvm-project/tree/main/.ci

@qinkunbao please take a look if you have time this week.
If not please reassign me.

[vitalybuka]

There was relevant discussion before #107983 (comment)

Sorry, probably I am not aware. I assumed pre-commit CI is https://github.com/llvm/llvm-project/actions/runs/12563251328/job/35025625406
And this is worklow file https://github.com/llvm/llvm-project/blob/1b09bb7b0fa1c101021dfd00ffc47f4689f085df/.github/workflows/libcxx-build-and-test.yaml
How to tell if it's running aarch64?

This is most of the pre-commit CI, but there is also https://buildkite.com/llvm-project/libcxx-ci/builds/37688, which mostly runs the different platforms. IDK how to see that after the fact though, or whether there is even any UI hint that it ever ran.

[qinkunbao]

Will work on it.