Pinned Commands - allow Build Target pinned commands to be build a target that was already selected

### Brief Issue Summary

In a CMake project with a hundred different targets it would be nice to have the ability to easily jump between the couple of targets I use all the time. So, When pinning Build Target the user could select the build target and the Pinned Build Target would always build that particular target. The current behavior is to always have to select a target to build when clicking on the pinned 'Build Target' command.

### CMake Tools Diagnostics

```shell

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### Debug Log

```shell

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### Additional Information

_No response_

Start by tracing the pinned “Build Target” command and its target-selection flow in the CMake Tools extension. Check how a pinned command stores or resolves its target, then verify that invoking it builds the selected target without prompting again; preserve normal target selection for unpinned commands.

Written by the indexing model from the issue text.