Create a struct that handles:
* initialization from existing kopia config info
* in-memory updates to config info
* detecting which config info structs from kopia need updated
* returning kopia config info structs
Overall, this allows us to isolate the logic for
calculating the new retention configuration info
in kopia
Viewing by commit may help.
First commit just splits up existing code, moving it into
either conn.go (will be used later) or retention/opts.go.
Subsequent commits switch to using a struct, add tests,
and fixup existing logic
---
#### 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
#### Test Plan
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E
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