The Backup Service should honor the GOMAXPROCS env var if specified

As part of addressing MB-47591 in 7.1.1, the services need to respect the value of the GOMAXPROCS env var if specified. FTS does this in a simple way here, though it seems a bit unnecessary as according to https://pkg.go.dev/runtime#GOMAXPROCS, the GOMAXPROCS default is runtime.NumCPU anyway. Query does it in a slightly more complicated fashion here, but it looks like it also works.

Perhaps the simplest thing to do for Backup is to remove this line of code, but I'll leave it in your hands as to how exactly you address this issue.