adds daemon flag for env var and turbo.json (#8728)
### Description
This PR adds support and testing for a `TURBO_DAEMON` environment
variable, as well as a `{ daemon: boolean }` field to the `turbo.json`
file. This change allows us to remove `daemon` from `RunOpts`, as well.
### Testing Instructions
You can run `turbo daemon status` to see the status of the daemon after
each run (and also `turbo daemon stop` to kill it).
#### Daemon Off
1. run with `--no-daemon`
1. run with `TURBO_DAEMON=false`
1. run with `{"daemon":false}` in your turbo.json
#### Daemon On
1. run with `--daemon`
1. run with `TURBO_DAEMON=true`
1. run with `{"daemon":true}` in your turbo.json
