refactor: use pino logger type directly, rm unused logger

[BlairCurrey]

Changes proposed in this pull request

• removes a couple mostly unused Loggers. They were only used for the return type so I just used the return type directly instead.

Context

fixes https://github.com/interledger/rafiki/issues/2707. See comment in issue.

Checklist

• [ ] Related issues linked using fixes #number
• [ ] Tests added/updated
• [ ] Documentation added
• [ ] Make sure that all checks pass
• [ ] Bruno collection updated

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