Test MarkdownString.supportHtml

[mjbvz]

Test for #40607

• AnyOS @chrmarti
• AnyOS @joyceerhl

Complexity: 4

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The new supportHtml property on MarkdownStrings allows extensions to enable raw html tags inside of markdown strings. Use the completion sample (or another API that supports MarkdownString) to test this proposal.

Things to check:

• Make sure html in markdown is disabled by default
• Make sure that html can only appear when you use appendMarkdown. Any html in appendText and appendCodeblock should not be rendered as html
• Try adding html that uses tags and attributes that we don't support, such as scripts and styles. Make sure these are not rendered