namespace defaults to `jx` for remoteCluster environment

[gazal-k]

The environment spec looks like:

spec:
  kind: Permanent
  label: Qat1
  namespace: jx-qat1
  order: 500
  promotionStrategy: Auto
  remoteCluster: true
  source:
    ref: master
    url: https://github.com/org/env-org-qat1.git

But promotion PR to env-org-qat1 always uses the namespace jx

- chart: dev/jx3-node-demo-app
  version: 1.0.6
  name: jx3-node-demo-app
  namespace: jx