Add tests for logger output methods

[cianc]

Description

Add tests for logger output methods and move test_logfire under the metrics subdirectory.

Related Issue

Please link to the issue this PR resolves: #972

Motivation and Context

Adds missing tests.

How Has This Been Tested?

All existing and new tests run and passed.

Screenshots (if appropriate):

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.
• All new and existing tests passed.