Merge branch 'main' into backend-indexing

* main:
  Avoid auto creation of indexes in concat (#8872)
  Fix benchmark CI (#9013)
  Avoid extra read from disk when creating Pandas Index. (#8893)
  Add a benchmark to monitor performance for large dataset indexing (#9012)
  Zarr: Optimize `region="auto"` detection (#8997)
  Trigger CI only if code files are modified. (#9006)
  Fix for ruff 0.4.3 (#9007)
  Port negative frequency fix for `pandas.date_range` to `cftime_range` (#8999)
  Bump codecov/codecov-action from 4.3.0 to 4.3.1 in the actions group (#9004)
  Speed up localize (#8536)
  Simplify fast path (#9001)
  Add argument check_dims to assert_allclose to allow transposed inputs (#5733) (#8991)
  Fix syntax error in test related to cupy (#9000)