[lldb/crashlog] Remove aarch64 requirement on crashlog tests (#94553)

This PR removes the `target-aarch64` requirement on the crashlog tests
to exercice them on Intel bots and make image loading single-threaded
temporarily while implementing a fix for a deadlock issue when loading
the images in parallel.

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>