We've found that reducing the MinEpochDuration parameter in kopia
can reduce GET requests sent to the object store by a large amount
(>50% in some cases) for repos that run many backups each day
This PR updates the init repo code path to set this parameter to
8hrs instead of the default 24hrs to bring in some of those savings
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#### 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
- [x] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Test Plan
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E
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