Fix Chosen connection form tracking interference

[CSWinnall]

Summary

• skip KTL's generic form-content tracking for Chosen-backed connection fields
• keep the existing dedicated .chzn-select dropdown change path for persistent-form updates
• add a backstop guard inside formContentHasChanged for non-select elements from Chosen connection fields

Testing

• targeted diff review
• local diagnostics check on touched code path

[Copilot]

Pull request overview

This PR adjusts Persistent Form’s generic “form content changed” tracking to avoid interfering with Chosen-backed connection fields, relying instead on the existing dedicated .chzn-select change handling and adding a defensive guard in formContentHasChanged.

Changes:

• Skip the document-level input handler for .kn-input-connection fields that contain a .chzn-select (Chosen-backed connections).
• Add a backstop in formContentHasChanged to ignore non-<select> events originating from Chosen connection field DOM.

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