Implements `lease_release?` on `NamespaceAggregation`

What does this MR do?

Implements lease_release? on Namespace::AggregationSchedule

Sets lease_release? to false to prevent the job to be re-executed more often than lease timeout

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/64079

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers

Closes #64079 (closed)