Baseline: b66e78bad319b5107a5d1be67343a5705360e87a

New features:

  - Added `--experimental_remote_cache_chunking_function` to select
    the content-defined chunking function used by
    `--experimental_remote_cache_chunking`. Supported values are
    `auto` (the default, which negotiates the function from the
    server capabilities, preferring FastCDC 2020), `fast_cdc_2020`
    and `rep_max_cdc`.

Important changes:

  - Fixed `repository_ctx.download_and_extract` failing with an
    "Expected a file with a ... suffix" error when
    `--downloader_config` blocks all URLs and the archive is served
    from the repository cache.
  - `--incompatible_modify_execution_info_additive` is now deprecated
    and a no-op. When `--modify_execution_info` is specified multiple
    times, all values are always applied in order.

This release contains contributions from many people at Google, as well as David Zbarsky, Fabian Meumertzheim, ifutivic, Keith Smiley, Tamir Duberstein.