Remove other implementation of Reasoner in the
selector package since it's a duplicate of the
one that's in the identity package
---
#### 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
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [x] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Test Plan
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [x] 💚 E2E
small cleanup in paths, primarily splitting files
so that file contents are more clearly owned, which should be a little better for readability and code placement.
Also renames `ServicePrefix` to `BuildPrefix` in
anticipation of multi-service prefixes.
no logic changes, just movement/renaming.
---
#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🧹 Tech Debt/Cleanup
#### Issue(s)
* #3993
#### Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🧹 Tech Debt/Cleanup
#### Issue(s)
* #3993
#### Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
