Investigate why intellisense doesn't work well in designer and warnings in JSON editor with standard examples

[licanhua]

[paulcam206]

as noted in Teams chat, this is because the schema we're handing to monaco is out of date:

https://github.com/microsoft/AdaptiveCards/blob/7bab78696cebcb558d97767d70f1e91eb02f5656/source/nodejs/adaptivecards-designer/src/card-designer.ts#L1019-L1029

we should:

• [ ] Update the schema being published at this url to the latest version: http://adaptivecards.io/schemas/adaptive-card.json
• [ ] Update or remove the schema specified in code here
• [ ] Consider turning on the enableSchemaRequest option

[rorik]

Hey, are there any updates regarding the schema publish change? This doesn't affect just the designer. It's a bit jarring when you open a quickstart sample and get warnings about not following the schema:

This can be mitigated by changing the schema in the code to https://raw.githubusercontent.com/microsoft/AdaptiveCards/main/schemas/1.4.0/adaptive-card.json or https://raw.githubusercontent.com/microsoft/AdaptiveCards/main/schemas/1.5.0/adaptive-card.json instead of http://adaptivecards.io/schemas/adaptive-card.json.

Not a breaking issue, but it makes getting started to people who have never worked with adaptive cards a little bit harder and to waste time investigating why the documentation does not correspond with what their IDE is saying. Speaking from personal experience.

Thanks!