Allow preview connection to take in a preview string to display #13293
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Summary of the Pull Request
When only the Profiles->Appearance page was using a preview control, it was okay to have a predefined 'preview' string that the preview control would display. Now that the ColorSchemes page also wants a preview control (to showcase all 16 colors), it makes sense to allow the page that is creating the preview control to decide what the preview string should be. So, the preview connection now takes in a preview string.
References
This is a prerequisite for #13269
PR Checklist
Validation Steps Performed
Profiles->Appearance preview control still works as before