DEV: Ability to distinguish between multiple identical targets with the same name but different controllers when adding targets

For the test framework

Scenario:
- Players A, B, and C each have a Sol Ring and you wish to specifically target player A's Sol Ring.

The same idea applies for things on the stack.

Came up in #9400

Start by locating the test framework's target-selection entry point and reading how targets are identified when several objects share a name. Reproduce the Sol Ring scenario with different controllers, then check the corresponding stack-target case; done means the framework can select the intended object in both situations.

Written by the indexing model from the issue text.