ci: run all unit tests in the mocked-API job (#45)

The mocked-API CI job invoked pytest with an explicit file list
(`tests/tests_mocked_api.py tests/test_batch_job_builder.py`), which
silently omits any new test module added to the suite and has needed
hand-editing more than once. Replace it with a directory invocation that
runs everything under `tests/` except the live-AWS suite (which needs
real credentials):

```
pytest tests/ --ignore=tests/tests_true_api.py -v
```

All workflow services and environment variables are preserved; only the
pytest selection changes. On `main` today this selects the same two
files — it future-proofs the invocation against the recurring list-rot.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Tests**
* Updated the continuous integration test run to execute the full test
suite, while skipping one API-dependent test file.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: nh13

.github/workflows/ci_mocked_api.yml

@@ -102,7 +102,7 @@ jobs:
         env:
           SNAKEMAKE_AWS_BATCH_JOB_QUEUE: "${{ secrets.SNAKEMAKE_AWS_BATCH_JOB_QUEUE }}"
           SNAKEMAKE_AWS_BATCH_JOB_ROLE: "${{ secrets.SNAKEMAKE_AWS_BATCH_JOB_ROLE }}"
-        run: poetry run coverage run -m pytest tests/tests_mocked_api.py tests/test_batch_job_builder.py -v
+        run: poetry run coverage run -m pytest tests/ --ignore=tests/tests_true_api.py -v
 
       - name: Run Coverage
         run: poetry run coverage report -m