meta-openharmony: SOURCE_MIRROR_URL_CH point to china IP Huawei Cloud Service data center

job .bitbake: define variable SOURCE_MIRROR_URL_CH pointing to Huawei Cloud Service data center.

https://gitlab.eclipse.org/eclipse/oniro-core/meta-openharmony/-/blob/kirkstone/.gitlab-ci.yml#L98

    SOURCE_MIRROR_URL_CH: http://114.116.235.68/source-mirror

And the sync is done on after_scriptin fetch job with this particular condition: https://gitlab.eclipse.org/eclipse/oniro-core/meta-openharmony/-/blob/kirkstone/.gitlab-ci.yml#L254

   - if [ "$CI_SERVER_HOST" = "gitlab.eclipse.org" -a
           "$CI_PROJECT_PATH" = "eclipse/oniro-core/meta-openharmony" -a
           "$CI_COMMIT_BRANCH" = "kirkstone" ] ; then
        DO_MIRROR_UPDATES_CH=1 ;
      fi

What do we do with these configuration?