ashmrtn e9afbaf0ec
Find previous kopia snapshots for given set of tags (#1427)
## 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
2022-12-01 19:07:44 +00:00

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Corso

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Corso is the first open-source tool that aims to assist IT admins with the critical task of protecting their Microsoft 365 data. It provides a reliable, secure, and efficient data protection engine. Admins decide where to store the backup data and have the flexibility to perform backups of their desired service through an intuitive interface. As Corso evolves, it can become a great building block for more complex data protection workflows.

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