Which Jira issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

Fixes SNOW-3052213

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• I am adding a new automated test(s) to verify correctness of my new code
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Please describe how your code solves the related issue.

Due to the server side depending on private members of the Session class, some changes from the previous PR need to be reverted. We need to keep _packages around, it now represents all packages under the _DEFAULT_ARTIFACT_REPOSITORY. Also reverted changing the argument positions of _resolve_packages.

There was another issue found where if the schema was not selected, the system function would error instead of propagating up. Fixed by explicitly setting the entity.