[full-ci] Use icon from app registered for the file type

[dschmidt]

Description

Use app icons as resource icons.

Motivation and Context

Apps can already specify an icon (with filltype and color), but it's not used for resource icons.
If a filetype does not exist in our default mappings, we just show a default file icon although we could (and want to) show the app icon.

How Has This Been Tested?

With my gpx viewer app. See screenshots and the definition in code here:
https://github.com/dschmidt/web-app-gpx-viewer/blob/main/src/index.ts#L12L14

Screenshots (if appropriate):

Notice the file icon which is a green map

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• handle priorities
• merge resourceIconColorExtensionMapping.json and resourceIconExtensionMapping.json to one file implementing OcResourceIconMapping
• tests 🙈
• the default mapping misses colors for some file types, should we add them? I could not find any reason why they should be missing

Follow up tasks

• add mimetypes to the default mapping
• handle icons per file type in apps/extensions

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[kulmann]

super nice! two nitpicks for possible improvements (see comments), but already works like a charm. 🚀

[kulmann]

ultra nit pick of the day: you could remove the color from all icon mappings where the value is "var(--oc-color-text-default)" since your implementation handles the default color as fallback if no color is defined 😁

[dschmidt]

I would prefer to handle that in a follow up at some point, when we add more mlmetype handling

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

59.2% Coverage
0.0% Duplication