Geo Primary verification: Hide checksum buttons and status when the model is not verifiable
### Problem to solve
When a model's replication is disabled, so is verification. Currently, in the new Data Management area, we're showing the `checksum` button and `verification_state` badge for all model records, even if they're un-verifiable.
### Proposal
Hide the state badge and checksum buttons when the model is not verifiable. This data is found in [`model_data`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/helpers/ee/geo_helper.rb?ref_type=heads#L95), in the `checksum_enabled` field.
In other words: if `model_data[:checksum_enabled]` is false, hide the badge and checksum buttons.
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