Update CI configuration to use VAULT_AUTH_ROLE directly
Update CI configuration to use VAULT_AUTH_ROLE
directly.
It is now set automatically to the readwrite role in main branch pipelines after https://ops.gitlab.net/gitlab-com/gl-infra/terraform-modules/gitlab/project/-/merge_requests/17
Needs https://gitlab.com/gitlab-com/gl-infra/infra-mgmt/-/merge_requests/838