markers: improve marker info node sorting (resource)

[vince-fugnitto]

Description

At the moment, there is no sorting present for MarkerInfoNodes in the 'problems view'.
Resources are added to view based on when their respective files were opened (in the case of .json) rather than sorted based on the resource's URI.

For example, if I open the file settings.json before b.json from the same directory, b.json is incorrectly displayed as last:

The reverse will yield the following result:

This is an error and makes traversing the 'problems view' quite difficult.
For reference, VS Code correctly sorts based on URI no matter which sequence the file(s) were opened:

There test-case also suggests they sort by resource.

[vince-fugnitto]

Closed thanks to #9691.