Enable Python Warnings In Tests

There are currently no warnings emitted during our tests, so this is a
low-cost method of ensuring we can better notice problems such as
deprecation warnings earlier.

Signed-off-by: Hassan Abouelela <[email protected]>

Author: HassanAbouelela

.github/workflows/lint-test.yaml

@@ -103,6 +103,7 @@ jobs:
           CI: True
           DATABASE_URL: postgres://pysite:pysite@localhost:7777/pysite
           METRICITY_DB_URL: postgres://pysite:pysite@localhost:7777/metricity
+          PYTHONWARNINGS: error
 
       # This step will publish the coverage reports coveralls.io and
       # print a "job" link in the output of the GitHub Action