Add '1 Week' Option to Past Horizon setting

I have updated the Google Calendar module to include the proposed '1 week' option in the Past horizon field, as detailed in the issue. This modification aims to enhance the module's functionality by allowing users to manage events on a weekly basis, which aligns with common event management practices.

The corresponding changes have been implemented and are available in the merge request: [Merge Request #7](https://git.drupalcode.org/project/google_calendar/-/merge_requests/7). I am moving the status of this issue to "Needs Review" to invite feedback, testing, and review from the community and maintainers. This review will ensure that the new feature integrates seamlessly with the module and functions as intended across different use cases.

I look forward to any comments or suggestions and am ready to make further adjustments if needed to align with the module's standards and user requirements.

I have completed testing the '1 Week' option in the 8.x-2.x branch of the Google Calendar module, and I'm pleased to report that it works as expected.

My testing involved integrating a Google Calendar with the module and creating a variety of test events, some within the past week and some older. After selecting the new '1 Week' option in the "Past horizon" field, I observed that the module correctly imported events from the past week, while excluding older events.

Thanks.

Automatically closed - issue fixed for 2 weeks with no activity.