✨ Revert pool status to draft from ready to publish

[vd1992]

✨ Feature

In response to the "submit for publishing" introduced in #7918 Give admin the ability to "reject" by reverting a pool back to draft

🕵️ Details

Frontend, platform admin can view and execute this action Backend, mutation to null out the field introduced in #7918 Policy, limited to platform admin

🎨 Design File

Include a link to the design file (if it exists).

🧑‍🎨 Designer

Include the author of the linked design file's name (or even better, their @githubUsername) for future reference.

📸 Screenshot

Add a screenshot of the new feature (if possible).

🙋‍♀️ Proposed Implementation

Add rejectProcess mutation that sets ready_at to null and connect it to the button

✅ Acceptance Criteria

A set of assumptions which, when tested, verify that the feature was properly implemented.

• [ ] platform admin can "reject" and revert to draft a pool that is submitted for publishing
• [ ] testing
• [ ] ?

🛑 Blockers

### Blocked By
- [ ] #7918

[tristan-orourke]

Blocked because we're not sure we actually want to do #7918