Automatic merge from submit-queue

Don't repeat the program name in healthCheckCommand.String()

The name is in both `Path` and `Args[0]`, so start printing args at 1.
Also refactor to avoid an extra space character in the output.

I pondered whether `healthCheckCommand.String()` should check if the slice is empty, to avoid a panic, but it didn't check for `Cmd==nil` before.

Fixes #29107