Run ARM64 smoke tests after AMD64, in parallel with the other tests.
Run ARM64 smoke tests after AMD64, in parallel with the other tests.

This means only the AMD64 smoke tests block all other steps, which speeds up
builds as ARM64 agents are more often contended for.

PiperOrigin-RevId: 452190945

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor