[ty] Ignore slow seeds as a temporary measure (#20870)

## Summary

Basically what @AlexWaygood suggested
[here](https://github.com/astral-sh/ruff/pull/20802#issuecomment-3402218389)
(thank you).

## Test Plan

CI on this PR

.github/workflows/ci.yaml

@@ -142,7 +142,7 @@ jobs:
         env:
           MERGE_BASE: ${{ steps.merge_base.outputs.sha }}
         run: |
-          if git diff --quiet "${MERGE_BASE}...HEAD" -- 'python/py_fuzzer/**' \
+          if git diff --quiet "${MERGE_BASE}...HEAD" -- 'python/py-fuzzer/**' \
           ; then
               echo "changed=false" >> "$GITHUB_OUTPUT"
           else