ashmrtn 8b9f63879b
Allow getting a path prefix from a string (#4132)
Will be required for selective subtree pruning since hierarchy merging starts at the category directory.

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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

#### Issue(s)

* #4117

#### Test Plan

- [ ] 💪 Manual
- [x]  Unit test
- [ ] 💚 E2E
2023-09-18 23:05:10 +00:00
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