Fix logging issues in stellar-etl writing to airflow

[chowbao]

PR Checklist

PR Structure

• This PR has reasonably narrow scope (if not, break it down into smaller PRs).
• This PR avoids mixing refactoring changes with feature changes (split into two PRs
  otherwise).
• This PR's title starts with the jira ticket associated with the PR.

Thoroughness

• This PR adds tests for the most critical parts of the new functionality or fixes.
• I've updated the README with the added features, breaking changes, new instructions on how to use the repository. I updated the description of the fuction with the changes that were made.

Release planning

• I've decided if this PR requires a new major/minor/patch version accordingly to
  semver, and I've changed the name of the BRANCH to release/_ , feature/_ or patch/* .

What

Updated some of the cmdLogger message types to error out properly when running stellar-etl in airflow.

cmdLogger.Error/Errorf does not actually return a status as failure from airflow's perspective. So these "errors" don't mark an airflow task as a failure. Only when an Error is coupled with cmdLogger.LogError or cmdLogger.Fatal/Fatalf will the airflow task be marked as failed.

Why

Fix the logging issues when running stellar-etl in airflow.

Known limitations

N/A

[chowbao]

Unrelated to the error issue. This is just to log less spam in our output