Patch sample devfiles in performance tests as we do in API tests.

After getting devfile yaml file from devfile-registry add next envs to dwt and dw:
```
env:

• name: CHE_DASHBOARD_URL
  value: '$devspacesUrl'
• name: CHE_PLUGIN_REGISTRY_URL
  value: $devspacesUrl/plugin-registry/v3
• name: CHE_PLUGIN_REGISTRY_INTERNAL_URL
  value: http://plugin-registry.openshift-devspaces.svc:8080/v3
  ```