Update getters to use namespace state metadata instead of group deletion schedule columns

Shane Maglangitrequested to merge
600364-replace-usages-of-marked-for-deletion-on into master

What does this MR do and why?

Remove usage of the marked_for_deletion_on group deletion schedule attribute.

References

Related to #600364 (closed)

How to set up and validate locally

  1. Enable the replace_group_deletion_schedule feature flag
  2. Schedule a group for deletion in Group Settings > Advanced > Delete
  3. Go to localhost:3000/api/v4/groups/:id and ensure that the marked_for_deletion_on is set.

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Edited by Shane Maglangit

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