Updates `DEPLOY_ENVIRONMENT` variables on `auto_deploy:deploy` build

Mayra Cabrerarequested to merge
fix-deploy-environment-variables-on-auto-deploy-build into master

What does this MR do?

DEPLOY_ENVIRONMENT on auto_deploy:deploy was using incorrect environment variables (gstg, cny, gprd-cny), this commit fixes to use the right ones (gst,gprd-cny,gprd)

This was noticed on https://ops.gitlab.net/gitlab-org/release/tools/-/pipelines/518031 / https://ops.gitlab.net/gitlab-org/release/tools/-/jobs/3409391 which triggered an empty deployer pipeline https://ops.gitlab.net/gitlab-com/gl-infra/deployer/-/pipelines/518095

Edited by Mayra Cabrera

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