Make a separate function to handle backup deletion.
Makes repo connection management a little bit
easier since a simple defer will work now.
Will also help keep things organized as we expand
these tests to do other things like use the
point-in-time function to check the deleted
backups are still accessible, especially since
that will require opening another connection
to the repo
---
#### Does this PR need a docs update or release note?
- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No
#### Type of change
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [x] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Issue(s)
* #3799
#### Test Plan
- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E
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