## Description
In a backup operation, begins the operation by
retrieving all backup manifests and metadata
from prior operations.
## Type of change
- [x] 🌻 Feature
## Issue(s)
* #1725
## Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
## Description
Minor fixes for flakey tests:
* Dedupe OneDrive folders by checking IDs. Should help remove some test flakes.
* Weaken checks on kopia snapshot manager tests as they use maps with indeterminate iteration orders
## Type of change
<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor
## Issue(s)
* closes#1660
* closes#1657
## Test Plan
<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E
## Description
Helper functions that allow finding the most recent complete
(and maybe incomplete) snapshots for a given set of tags. The
returned snapshots can later be used to do more efficient kopia
snapshots by allowing kopia to determine it's already uploaded
a file and skip uploading it again.
The number of most recent snapshots to return can be tuned (right
now it returns 1 most recent), but may cause more memory usage
during backups.
Kopia currently has some oddities when getting snapshot
manifests via tags:
* tag values cannot be empty or the comparison returns always
true, selecting all snapshot manifests
* kopia does not currently tag snapshot manifests made during
checkpoints. A patch to upstream kopia is needed to fix this.
All other manifests that match the tags will be returned though
Added code is not currently connected to any backup logic.
Viewing by commit may help as there was a tad of lift'n'shift code
movement for the sake of organization
## Type of change
<!--- Please check the type of change your PR introduces: --->
- [x] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor
## Issue(s)
* #1404
## Test Plan
<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E
