Silence error logs in `zed` tests (#13069)

This PR silences the remaining error logs in the `zed` crate tests by
initializing `env_logger` in test mode.

This means that the logs will no longer be shown unless `--nocapture` is
passed to `cargo test`.

Release Notes:

- N/A
ea69846281Marshall Bowers committed on 6/14/2024, 8:30:15 PM· committed by GitHubparentff8486e
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