No longer required by SDK users and not exposed directly to CLI users unless they're looking at the JSON output from details. This field is not documented anywhere though so there's no guarantees that we technically need to uphold with it.
Manually tested:
* restoring from a backup that had this field
* making a fresh backup without this field when the merge base did have this field
---
#### 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
- [ ] 💻 CI/Deployment
- [x] 🧹 Tech Debt/Cleanup
#### Issue(s)
* closes#3986
#### Test Plan
- [x] 💪 Manual
- [x] ⚡ Unit test
- [x] 💚 E2E
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