Gitlab:geo:check: exclude AuthorizedKeysCommand check if not running Puma/Unicorn

In Step 4 of the upgrade docs for multi-server Geo, we run rake gitlab:geo:check on the deploy nodes. There are checks related to AuthorizedKeysCommand that do not apply to all types of deploy nodes (for example Sidekiq nodes), and will return irrelevant results when run on those nodes.

We should not perform these checks if the node does not run Puma/Unicorn