(feature) Enable to filter search within changed files of source tree (#314790)

* (feature) Enable to filter search within changed files of source tree

* enable/disable toggle based on SCM repositories

* feat: add disabled state to custom toggle and update search in changed files functionality

* Updates after copilot CR

* use editCode icon and flatMap for changed file URIs collection

* Enable changed files toggle only when repository has changes

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Co-authored-by: dgercho <dgercho@outlook.com>
Co-authored-by: Osvaldo Ortega <48293249+osortega@users.noreply.github.com>