Quota should not be hard-coded

[jshufro]

rescue-proxy/router/authentication.go

Lines 17 to 20 in 314e8e9

	var validityWindow = map[credentials.OperatorType]time.Duration{
	pb.OperatorType_OT_SOLO: time.Hour * 24 * 10,
	pb.OperatorType_OT_ROCKETPOOL: time.Hour * 24 * 15,
	}

Basically, for rescue-proxy, we can just add new cli flag(s) to provide these, with the current values as defaults.