Option to disable !2987

Nobody has claimed this yet.

### Brief Issue Summary

[!2987](https://github.com/microsoft/vscode-cmake-tools/pull/2987) builds both the build target and the executable when pressing the run button. In my case, this is a breaking change for the extension.

I am using the setup for unittests. The build target most of the times is the coverage target, that builds and runs all tests and creates a coverage report. When I am developing a unittests, I select it as the executable. When I am now pressing the run button, it first runs the coverage target, which takes some time, before running the executable. I would have to select the executable as build target aswell and switch back to the coverage target if needed. This would mean many unnessecary steps, which were not required before this PR.

Is there any way to disable this new feature?

### CMake Tools Diagnostics

_No response_

### Debug Log

_No response_

### Additional Information

_No response_

Start by reviewing pull request !2987 and the run-button flow that now builds both the selected build target and executable. Trace how build and executable selections are handled, then identify the existing configuration path for an opt-out. Done means users can disable the new behavior and run the selected executable without the extra build-target step.

Written by the indexing model from the issue text.