Test: Clickable links tsconfig.json for project references

[mjbvz]

Test for #54104

• Mac @sbatten
• Linux @misolori
• Windows @aeschli

Complexity: 1

Summary
With TS 3.0, tsconfig.json files may also specify project referecenes.

{
    "references": [
        { "path": "./other/project/tsconfig.app.json" }
    ]
}

This references field can either be a path to a json file, or a path to a folder that contains a tsconfig.json folder

The project references paths should now be clickable links in VS code.

Test
Test that both types of links (links to tsconfigs and to folders containing tsconfigs) are clickable in VS Code and open the correct file when clicked. All paths should be resolved relative to the current tsconfig.json