fs: Use public-api-only tests (#47149)

This reduces time needed to build tests for fs from 1.2s to 0.6s.
Release Notes:

- N/A
2be94ce893Piotr Osiewicz committed on 1/22/2026, 9:22:29 AM· committed by GitHubparent1f4741c
7 files changedLine totals unavailable