[#3473000] Add note about manually setting DRUPAL_CORE when running...

James Shieldsrequested to merge
issue/gitlab_templates-3473000:3473000-doc-update-9 into main
  • Add 'previous major' to list of variants.
  • Add note about manually setting DRUPAL_CORE when running upgrade_status (and encourage manual pipelines)

Closes #3473000

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