x/build: allow passwordless sudo for powermetrics on darwin-amd64 builders (for gomote) #73026
Description
In #49679, I am investigating an issue with idle wakeups. powermetrics is a built-in macOS command that can display various process-level metrics such as wakeups. It is particularly useful on a gomote where I cannot see the Activity Monitor.
Unfortunately, it must be run as a superuser, and our builders do not allow sudo. It turns out that the darwin-arm64 builders are already configured to allow just powermetrics with passwordless sudo. We should do the same for the amd64 builders (and arm64 when we migrate to the same infra as amd64).