perf: Post apply pyarrow filter in Polars' engine instead of pyarrow (#27192)

chore: Remove unused attributes (#27191)

fix: Don't trigger csv fast count if predicate is pushed down (#27190)

perf: Optimize `drop_nulls().{first,last}()` to `{first,last}(ignore_nulls=True)` (#27187)

fix(python): Support all integer dtypes for Series index assignment (#27188)

perf: Always process pyarrow scan in batches (#27183)

chore: Avoid unnecessary recompilation due to changing env vars (#27166)

fix: Streaming sort by-expressions were lowered incorrectly (#27158)

fix(python): Replace multiprocessing.dummy.Pool with ThreadPoolExecutor (#27175)

perf: Make `cut` output `Enum` and mark as elementwise (#27173)

Revert "feat: Support casting Duration to String in ISO 8601 format" (#27161)

feat(rust): Add a GPU slot to OptFlags so we can control CSE (similar to streaming) (#27026)

fix: Reset IO metrics instead of consuming (#27156)

feat: Allow `group_by()` without key exprs (#27141)

chore: Update nightly Rust compiler version (#27145)