Avoid redundant filesystem metadata probes - #36898
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## What changed - Reuse directory-entry file types in local memory listing while continuing to exclude symlinks, and reuse rollout metadata when reading modification times. - Avoid following non-symlinks twice in direct filesystem metadata and directory listing operations while preserving target classification for valid symlinks. ## Testing - Cover symlink handling in local memory listing and search. - Extend Unix filesystem tests for followed file and directory symlinks and dangling metadata links. GitOrigin-RevId: e4e24576e2e9db704f9da54727928e121f81dc86
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Avoid redundant filesystem metadata probes
What changed
exclude symlinks, and reuse rollout metadata when reading modification times.
listing operations while preserving target classification for valid symlinks.
Testing
dangling metadata links.