Increase CI job 'when delayed' limit to 1 week

What does this MR do?

Increases the upper limit of the start_in attribute used with the when: delayed job attribute to 1 week. It is currently 1 day.

This could be used with jobs that tear down resources such as review apps whereby 1 day is too short.

It closes #28890 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.