Remove environment_test.sh

These config variables are now set in `pytest.ini` instead.

scripts/run_tests.sh

@@ -5,12 +5,8 @@
 # NOTE: This script expects to be run from the project root with
 # ./scripts/run_tests.sh
 
-# Use default environment vars for localhost if not already set
-
 set -o pipefail
 
-source environment_test.sh
-
 function display_result {
   RESULT=$1
   EXIT_STATUS=$2