[JS] Display title other than value in Filtered ChoiceSetInput

[licanhua]

Fix #6514

Because https://stackoverflow.com/questions/29882361/show-datalist-labels-but-submit-the-actual-value, the value is displayed when option is selected.
.value is not user friendly to user, so use .title to workaround the problem.
In the input, .title is used, then in value(), look up the datalist and return the actual option.value

known issue about this issue: wrong .value may be returned if two .title items are the same in the choice set. so we don't support duplicated .title in choiceset with filter

Before:

After:

			"items": [
				{
					"type": "Input.ChoiceSet",
					"choices": [
						{
							"title": "Apple Cider",
							"value": "1"
						},
						{
							"title": "Grape Juice",
							"value": "2"
						},
						{
							"title": "Banana Smoothie",
							"value": "3"
						},
						{
							"title": "Orange Juice",
							"value": "4"
						}
					],
					"placeholder": "Type Some To Expand",
					"style": "filtered",
					"label": "1.5 Filtered Style",
					"id": "2"
				},

Microsoft Reviewers: Open in CodeFlow

[ghost]

Hi @licanhua. Thanks for helping make the AdaptiveCards JS renderer + tooling better. As additional verification, once the JS build succeeds, please go to the test site to test out your website/designer changes.

[almedina-ms]

[RebeccaAnne]