test: forbid use of named imports for fixtures

[aduh95]

Having import { path } from '../common/fixtures.mjs results in path to refer to a function, which is confusing as it more often refers to node:path. In general, most utils of this module benefits from being prefixed with fixtures. (i.e. fileURL(…) vs fixtures.fileURL(…)).

Refs: #61089 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.53%. Comparing base (7b7f693) to head (569a684).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61228      +/-   ##
==========================================
- Coverage   88.54%   88.53%   -0.02%     
==========================================
  Files         704      704              
  Lines      208738   208738              
  Branches    40278    40273       -5     
==========================================
- Hits       184833   184806      -27     
- Misses      15914    15952      +38     
+ Partials     7991     7980      -11     

see 31 files with indirect coverage changes

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