Allow openFeedbackWidget to open specific board by ID

I want to be able to open a specific feedback board using a stable ID with the `openFeedbackWidget` function.

This is important because I want to avoid updating my code every time a board name changes.

Currently, there is no documented way to achieve this or to retrieve board IDs for this purpose.

i.e.

window.postMessage({
    target: 'FeaturebaseWidget',
    data: { 
      action: 'openFeedbackWidget',
      setBoardID: 'abcdef-123-123', // optional - preselect a board by ID
    }
})