Investigate why `list-keys` makes repeated API calls
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Current evaluation
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Issue body
### What needs to get done
See if we can reduce the number of API calls in `snapcraft list-keys`.
### Why it needs to get done
`snapcraft list-keys` makes repeated API calls to list keys, which can be seen in the unit tests [here](https://github.com/canonical/snapcraft/blob/d5ddb55443782ef571ec97a53b92f8d58b3eac74/tests/legacy/unit/commands/test_list_keys.py#L29).
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