feat: rework SSL certificate issuance

Description

This MR reworks how SSL certificates are issued for the cluster. From now on, all SSL certificate should be valid and created by a single resource.

Supporting information

• https://tasks.opencraft.com/browse/SE-6062

Testing instructions

Steps to test the changes:

1. Visit https://openfaas.staging.do.opencraft.hosting/ and validate the certificate is signed by let's encrypt.

Dependencies

N/A

Screenshots

N/A

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

Additional context

N/A