Mark resource and group description as computed

[jan-opal]

Description of the change

Currently when creating resources / groups via Terraform, if the user does not provide a description, the first sync of the imported resource / group will put a default description in.

This causes terraform plan to have a diff after creation. This avoids this.

NOTE: One issue with this solution is that the terraform provider SDK is not able to differentiate between not set at all and set to zero value. This means that it will not be possible to remove the description from Terraform once this change is made.

See hashicorp/terraform-plugin-sdk#1101

We can eventually mitigate this by migrating to a newly developed SDK https://github.com/hashicorp/terraform-plugin-framework

Checklist

• I performed a self-review of my code
• I manually tested my code change (please list details in description)
• I added unit tests
• I updated the changelog
• I updated the public facing docs

[tim-opal]

Discussed with Jan out of channel. We think we want to fix this also by not generating default descriptions in Opal, but may merge this as a stop-gap

[giulio-opal]

Can we revert this when we stop auto-generating descriptions in the backend?

[jan-opal]

Can we revert this when we stop auto-generating descriptions in the backend?

I think we'll be preserving the ability to import descriptions from the remove, so this would still be generally useful