Fix stale IntelliSense config after preset switches#4874
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Fixes stale cpptools custom-configuration entries that could persist after reconfigure/preset changes and cause Go to Definition to include inactive sources.
Changes
Clear stale per-folder file-index entries before rebuilding cpptools configuration data.
Track indexed files per folder to evict old mappings safely.
Add a regression unit test for folder refresh/preset-switch behavior.
Add CHANGELOG bug-fix entry referencing #4472.
Validation:
Once a preset is set, IntelliSense is now able to find source correctly.
