Update link to package_metadata_sync cron job

What does this MR do and why?

This MR updates the link to the package_metadata_sync cron job added by Add package_metadata sync offline troubleshooting (!131802 - merged) because it currently points to the gitlab_subscriptions_schedule_refresh_seats_worker which seems incorrect.

Screenshots or screen recordings

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.