[workers] WorkerManager should keep uid, gid from config

[LaurenceJJones]

https://github.com/crowdsecurity/cs-haproxy-spoa-bouncer/blob/3c6a8aa47cf440f05e8dc0ee3035a9fe454f0126/cmd/root.go#L228

The worker manager should have the uid and gid of the socket permission instead of being set on startup by the config handler.

Reasons:

• Admin socket can create workers on adhoc basis and needs to be able to set uid, gid on socket.

[LaurenceJJones]

remove: https://github.com/crowdsecurity/cs-haproxy-spoa-bouncer/blob/3c6a8aa47cf440f05e8dc0ee3035a9fe454f0126/pkg/cfg/config.go#L89-L92

[LaurenceJJones]

Set worker uid and gid here from manager context:

https://github.com/crowdsecurity/cs-haproxy-spoa-bouncer/blob/3c6a8aa47cf440f05e8dc0ee3035a9fe454f0126/internal/worker/root.go#L87-L95