Integration tests: port to pytest.

Requires an internal PR.

javascript/ql/integration-tests/all-platforms/diagnostics/syntax-error/test.py

@@ -1,7 +1,2 @@
-import os
-from create_database_utils import *
-from diagnostics_test_utils import *
-
-run_codeql_database_create([], lang="javascript", runFunction = runSuccessfully, db = None)
-
-check_diagnostics()
+def test(codeql, javascript):
+    codeql.database.create()