[UWP Renderer] Update ActionSet fallback

[anna-dingler]

Related Issue

Fixes #8323

Description

When attempting to handle the fallback scenario for an action, we throw an E_FAIL error if no mechanism is provided (default).

AdaptiveCards/source/uwp/SharedRenderer/lib/ActionHelpers.cpp

Lines 734 to 756 in 38b8f09

	while (!renderer)
	{
	auto actionTypeString = action.ActionTypeString();
	renderer = actionRegistration.Get(actionTypeString);
	if (!renderer)
	{
	switch (action.FallbackType())
	{
	case winrt::FallbackType::Drop:
	XamlHelpers::WarnForFallbackDrop(renderContext, actionTypeString);
	return nullptr;
	case winrt::FallbackType::Content:
	action = action.FallbackContent();
	XamlHelpers::WarnForFallbackContentElement(renderContext, actionTypeString, action.ActionTypeString());
	break; // Go again
	case winrt::FallbackType::None:
	default:
	throw winrt::hresult_error(E_FAIL);
	}
	}
	}

This error is never handled, and an error is shown in the visualizer.

I added a try/catch block surrounding this method call so that we continue rendering even if we drop the action.

I also updated the actionType when getting FallbackContent.

Sample Card

https://github.com/microsoft/AdaptiveCards/blob/main/samples/v1.2/Elements/ActionFallback.json

How Verified

Verified manually on the AdaptiveCards Visualizer.

Microsoft Reviewers: Open in CodeFlow

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