Test MarkdownString.baseUri api proposal

[mjbvz]

Refs #142051

• Mac @bpasero
• Linux @lramos15
• Windows @rzhao271

Complexity: 4

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This tracks testing of the proposed baseUri property on MarkdownString. This property allows specifying a uri to use for resolving relative links (both clickable links and images) that appear inside of the markdown string

Testing:

• Using the Completions sample, try creating Markdown strings that use relative links for images and clickable links.
  • Check that when the baseUri is set, these resources are resolved relative to the baseUri

Note that while baseUri is an API proposal, we don't have a good way to gate it at runtime