Support liquid fields for issue and evidence tables

[gcelanji]

Summary

Currently, even though Liquid works as expected in Word filters and other contexts, it cannot be displayed properly in the Issues/Evidence tables.

Leverage the existing liquid-async and preview flow to render liquid content for issues and evidence field tables.

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Check List

• Added a CHANGELOG entry
• Commit message has a detailed description of what changed and why.

[caitmich]

I'd set this in the controller like we do with @form_preview_path

[gcelanji]

Because the index action only handles the collection, the controller cannot access a specific evidence instance variable to set the preview_path. Therefore, we must either add logic to iterate over all evidence records in the controller index action, or use the Evidence.new approach to generate a reusable path template for JS to update the path with the correct ID.

In this specific context, neither of those two options is worth the added complexity or performance drop. The simplest and most efficient solution is to keep the path generation in the view partial's loop, where the evidence is availiable.