## Description
Switches the CLI from calling `DiscreteScopes` to `SplitByResourceOwner`
on the selector itself. This func will take the original selector and produce
a slice of selectors, each one with a DiscreteOwner (the single user involved
in usage of that selector) and all include/filter scopes in that selector re-rooted
to that discrete owner.
Does not yet solve the per-category tuple, since we are still pivoting on the
scopes inside the selector. That comes as a later change.
## Does this PR need a docs update or release note?
- [x] ⛔ No
## Type of change
- [x] 🌻 Feature
## Issue(s)
* #1617
## Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
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