chore(tests): improve GHA pytest-xdist performance (#2575)

Author: khvn26

api/.env-ci

@@ -1,3 +1,3 @@
 DATABASE_URL=postgresql://postgres:postgres@localhost:5432/postgres
 ANALYTICS_DATABASE_URL=postgres://postgres:postgres@localhost:5432/analytics
-PYTEST_ADDOPTS=--cov . --cov-report xml -n auto
+PYTEST_ADDOPTS=--cov . --cov-report xml -n auto --dist worksteal