Add support for 'jp' region in GitHub status check functions

[MariusStorhaug]

Summary

Add support for the Japan ('jp') region in the GitHub status check functions.

Background

GitHub Enterprise Cloud data residency in Japan is now generally available (announced December 18, 2025). This introduces a new regional status endpoint for Japan-based GitHub Enterprise Cloud customers.

Details

• Japan status page: https://jp.githubstatus.com/
• Main announcement: https://github.blog/changelog/2025-12-18-github-enterprise-cloud-data-residency-in-japan-is-generally-available/

The PSModule/GitHub status check functions should be updated to support the 'jp' region alongside any existing regions, allowing users to check the status of GitHub services in Japan.

Expected Behavior

Users should be able to query the Japan region status using a parameter like -Region jp or similar, which would check the status from https://jp.githubstatus.com/.

References

• GitHub Enterprise Cloud with data residency in Japan allows customers to store their code and repository data in Japan
• This helps customers meet their compliance, regulatory, or data residency needs in the region