Double-clicking on one of a target's "References" does nothing

### Brief Issue Summary

The project outline currently correctly lists referenced targets of a target correctly. But double-clicking currently does nothing.

### Expected behavior

On double-clicking a reference, open the CMake file containing the corresponding `add_executable`, `add_library` etc. call and scroll to the respective line.

This is the current behavior of Visual Studio 2022 when opening a folder containing a CMake project.

### Actual behavior

Nothing happens.

### CMake Tools Diagnostics

_No response_

### Debug Log

_No response_

### Additional Information

VS Code: 1.91.0
Tested extension version: v1.18.42

Start with the project outline's References view and its double-click interaction. Trace how referenced CMake targets are represented and located, then verify that activating a reference opens the CMake file at the corresponding add_executable or add_library line.

Written by the indexing model from the issue text.