feat: expose ES certificate in PEM form

Description

This exposes Elastic Search CA certificate in PEM format to terraform to make it possible to configure connections to the shared ES instance form various services without having to deal with extra k8s volumes.

Supporting information

See the grove-contrib-tutor PR for more info.

Testing instructions

Follow the instructions on the grove-contrib-tutor PR.

Dependencies

• tutor-contrib-grove!52 (merged)

Checklist

If any of the items below is not applicable, do not remove them, but put a check in it.

• All providers include the new feature/change
• All affected providers can provision new clusters
• Unit tests are added/updated
• Documentation is added/updated
• The TOOLS_CONTAINER_IMAGE_VERSION in ci_vars.yml is updated
• The grove-template repository is updated