[model-gateway] rename py_test to e2e_test (#16454)

sgl-model-gateway/e2e_test/e2e_grpc/pytest.ini

@@ -0,0 +1,13 @@
+[pytest]
+# Show print statements and logs
+log_cli = true
+log_cli_level = INFO
+log_cli_format = %(asctime)s [%(levelname)8s] %(message)s
+log_cli_date_format = %Y-%m-%d %H:%M:%S
+
+# Show stdout/stderr
+addopts = -v -s --tb=short
+
+# Capture settings
+# -s means don't capture stdout (show print statements)
+# --tb=short means short traceback format