This option is only consumed by Exchange right now and will control the number of items fetched in parallel per collection. Note that the total number of parallel item fetches may be higher is kopia is concurrently uploading multiple collections.
This PR does not expose this option at the CLI layer
Manually tested to ensure it
* uses the default if options value is 0
* uses the default if options value > default
* uses option value otherwise
There's another PR open for this but it's not expected to main. We still
want to make sure the change goes in though, hence this PR.
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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
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Test Plan
- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E
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