Commits on Jan 31, 2024

1. Breaking Change: Removed obsolete/duplicate setup.py from Python. …

   This copy of `setup.py` is obsolete, as it builds the old C++ backend for Protobuf, which has been deprecated and
   unused since 4.21.0 when
   [the backend was switch to upb](https://protobuf.dev/news/2022-05-06/#python-updates).
   
   The `setup.py` that we actually distribute in our source packages is located in [`python/dist/setup.py`](https://github.com/protocolbuffers/protobuf/blob/main/python/dist/setup.py).  It is not possible to build this `setup.py` directly from the GitHub repo or GitHub release tarball, because it depends on the file layout of our Python source package ([as distributed on PyPI](https://pypi.org/project/protobuf/#files)).  The Python source package uses a layout that pulls together all of the things Python needs:
   
   |Python Source Package Path|GitHub Repo Path|Description|
   |-----|-----|-----|
   |`setup.py`|`python/dist/setup.py`|
   |`google/protobuf/*`|`python/google/protobuf/*`|pure Python sources|
   |`python/*`|`python/*`|C extension sources|
   |`utf8_range/*`|`third_party/utf8_range`|C UTF-8 Validation Library|
   |`upb/*`|`upb/upb/*`|C Protobuf Library|
   
   Users who want to build their own Python packages should build from our source package on PyPI, not from our GitHub repo or our GitHub release tarball.
   
   It is also possible to build our source package from GitHub using the following command (this requires Bazel):
   
   ```
   $ bazel build //python/dist:source_wheel
   ```
   
   PiperOrigin-RevId: 603162788

   

   haberman authored and copybara-github committed Jan 31, 2024
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