chore: Move cli tests into correct directory

[abbiemery]

The cli tests were in the root unit test dir, when the cli now has its own module. This makes it match the src layout.

[abbiemery]

Not the quick win I envisioned. The fixture for reloading opentelemetry tracing is causing havok.

[tpoliaw]

The import reloading is breaking the setup_tracing function from observability utils (OU).

• OU imports ProxyTracerProvider
• OU.setup_tracing compares the global tracer_provider to ProxyTracerProvider and does nothing if it isn't one
• The exporter fixture in conftest.py assumes setup_tracing did something

When the trace module is reloaded, the imported ProxyTracerProvider is not reloaded in OU so the isinstance always returns False.

The same effect can be seen in a repl

>>> from pathlib import Path
>>> import pathlib, importlib
>>> importlib.reload(pathlib)
<module 'pathlib' from '/home/qan22331/.local/share/uv/python/cpython-3.14.0-linux-x86_64-gnu/lib/python3.14/pathlib/__init__.py'>
>>> isinstance(pathlib.Path('/tmp'), Path)
False

I not sure the reload_opentelemetry_trace_after_tests fixture ever worked and the fact these tests ever pass is mainly down to luck - even on main they fail if you run them in the wrong order

$ uv run pytest tests/unit_tests/test_cli.py tests/unit_tests/client/test_client.py

Removing the fixture and autouseing the exporter fixture lets the tests pass both before and after moving the cli module.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.17%. Comparing base (a438d99) to head (683e8b9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1406   +/-   ##
=======================================
  Coverage   95.17%   95.17%           
=======================================
  Files          43       43           
  Lines        3111     3111           
=======================================
  Hits         2961     2961           
  Misses        150      150           

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