models: reuse path url logic for filesystem

[nijel]

Proposed changes

The logic is same and needs to account future categories.

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[codecov]

Codecov Report

Merging #9730 (0ac1dd1) into main (0cade25) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9730   +/-   ##
=======================================
  Coverage   90.83%   90.83%           
=======================================
  Files         768      768           
  Lines       56283    56283           
  Branches     8749     8749           
=======================================
  Hits        51125    51125           
  Misses       3608     3608           
  Partials     1550     1550           

Files Changed	Coverage Δ
...ons/0001_squashed_0074_fix_broken_browser_alert.py	72.34% <ø> (ø)
weblate/trans/mixins.py	96.96% <100.00%> (+0.09%)	⬆️
weblate/trans/models/component.py	80.73% <100.00%> (ø)
weblate/trans/models/project.py	91.78% <100.00%> (-0.06%)	⬇️