fix(ci): Add missing XML results from various tests

Author: dcramer

Makefile

@@ -156,7 +156,7 @@ test-acceptance: build-platform-assets
 
 test-python-coverage: build-platform-assets
 	@echo "--> Running Python tests"
-	SOUTH_TESTS_MIGRATE=1 coverage run --source=src/sentry -m py.test tests/integration tests/sentry
+	SOUTH_TESTS_MIGRATE=1 coverage run --source=src/sentry -m py.test tests/integration tests/sentry --junit-xml="junit.xml"
 	@echo ""
 
 lint: lint-python lint-js