getFileUrl returns inconsistent URL schema

asset.getFileUrl() returns inconsistent URL

This issue is noted at https://forum.playcanvas.com/t/x-frame-options-deny-on-assets/23837/3

Steps to Reproduce

1. Create a new PlayCanvas project
2. Add an asset such as index.html
3. Launch the project
4. In the JavaScript console type:

pc.app.asset.findAll('index.html', 'html')[0].getFileUrl();

Result

The response is a relative URL. i.e.
/api/assets/files/Library/MyProject/index.html?id=656796

Expected Response

We should get a FQURL (fully qualified/absolute URL) as we do when publishing. i.e.
https://s3-eu-west-1.amazonaws.com/apps.playcanvas.com/HSBSlcXy/..

Workaround

Currently we can sense when the API is accessed in launcher vs published; check the domain origin, look for the debug flag, or check for the protocol, and append the origin for relative assets i.e.

var url = pc.app.asset.findAll('index.html', 'html')[0].getFileUrl();
if (url.substring(0,4) != 'http') {
   url = window.location.origin + url;
}

Start at the asset.getFileUrl() entry point shown in the reproduction and inspect how it constructs URLs in the editor. Reproduce the console call with an asset such as index.html, then compare the result with the published URL behavior. Done means the method returns a fully qualified URL rather than the current relative path.