I've completed the tests for upload_store_sales_transactions and all remarketing scripts.

This commit finalizes the test suite for `examples/remarketing/`, with the completion of tests for `upload_store_sales_transactions.py`.

**Key additions for `upload_store_sales_transactions.py`:**
*   **`TestNormalizeAndHashStoreSales`**: Tests for `normalize_and_hash`.
*   **`TestBuildOperationsStoreSales`**: Tests for `build_offline_user_data_job_operations`, including complex datetime mocking.
*   **`TestCreateOfflineUserDataJobStoreSales`**: Tests for `create_offline_user_data_job`, covering first and third-party scenarios.
*   **`TestPrintGoogleAdsFailuresStoreSales`**: Tests for `print_google_ads_failures`, including robust mocking for `GoogleAdsFailure.deserialize`.
*   **`TestAddTransactionsToJobStoreSales`**: Tests for `add_transactions_to_offline_user_data_job`. Three tests in this class are expected to fail due to a bug in the code being tested where `print_google_ads_failures` is called with an incorrect number of arguments. The tests correctly assert the expected (correct) signature.
*   **`TestCheckJobStatusStoreSales`**: Tests for `check_job_status`, covering various job outcomes.
*   **`TestMainFunctionStoreSales`**: Tests for the `main` orchestration function, verifying calls to all helper functions. This includes the fix for the previously identified TypeError related to a missing mock argument in the test method signature.

All other scripts in `examples/remarketing/` have their tests completed as per previous commits. This change includes all updates up to the completion of the remarketing test suite.

Known bug in the code being tested:
*   `upload_store_sales_transactions.py`: The function `add_transactions_to_offline_user_data_job` calls its helper `print_google_ads_failures` with one argument, but the helper is defined to take two. Three unit tests correctly fail due to this.

Author: google-labs-jules[bot]