fix: resolve test hang caused by PostgreSQL lock conflict in test_cell.py

[aabhinavvvvvvv]

Root Cause

test_cell.py had two tests using different fixtures (setup_cells and init_database) in the same module. After test_cell_search_by_name ran a SELECT via Cell.search_by_name(), SQLAlchemy left an open implicit transaction holding a PostgreSQL AccessShareLock on the cell table. When init_database then called db.drop_all(), it needed AccessExclusiveLock — which PostgreSQL waited for indefinitely → hang.

[jmadden173]

lgtm. Checked that the tests ran fully locally. Please fix the upstream conflict and I will merge in.

[jmadden173]

Actually looks like I was able to fix the conflict. Can you run black on the code to fix the linting?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
backend	70.62% <100.00%> (-0.04%)	⬇️
frontend	52.18% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
backend/tests/conftest.py	82.89% <ø> (-1.99%)	⬇️
backend/tests/test_cell.py	100.00% <100.00%> (ø)

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[aabhinavvvvvvv]

@jmadden173 This PR is ready for review