Fix asset file serving

[SchrodingersGat]

• Backport of Static Asset Management #9292

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.39%. Comparing base (21d266a) to head (2c38b93).
Report is 1 commits behind head on 0.17.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           0.17.x    #9295      +/-   ##
==========================================
- Coverage   84.43%   84.39%   -0.05%     
==========================================
  Files        1201     1201              
  Lines       54876    54868       -8     
  Branches     2100     2100              
==========================================
- Hits        46335    46304      -31     
- Misses       8021     8049      +28     
+ Partials      520      515       -5     

Flag	Coverage Δ
backend	86.11% <ø> (-0.01%)	⬇️
pui	68.81% <ø> (-0.23%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.