ashmrtn 4ebb2d3bfb
Common structs/mocks/consts for assist backups (#3985)
Pull into separate PR so we can start merging things separately.

`BackupBases` sourced from branch `backup_bases_changes`
`model.go` sourced from branch `partial_bup`
mock backup bases sourced from branch `backup-details-merge`

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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
- [ ]  Unit test
- [ ] 💚 E2E
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