Outstanding Python 3.14 and Pants 2.32.0.dev2 tasks

[sureshjoshi]

• Added Python 3.14 support and bumped Pex, PBS, Science, and Rust versions scie-pants#490 Release updated scie-pants
• Added support for using Python 3.14 on Pants 2.32 actions#46 Release updated GH actions
• bump ruff language version to 3.14 #23140 Update ruff to use python 3.14
• Remove the "Install Python headers" from the workflows
• Removed libcst, cstutil, and updated 3rd party requirements/lockfiles #23117 Remove libcst and the associated cstutil stuff (was used in migrate-call-by-name)
• silence new HdrHistogram induced deprecation warning on Python 3.14 #23144 DeprecationWarning: Due to 'pack', the 'ExternalHeader' Structure will use memory layout compatible with MSVC (Windows)
• add missing flush/close methods to PyStdioRead / PyStdioWrite #23122 AttributeError: 'builtins.PyStdioRead' object has no attribute 'close' (pants_loader.py", line 106, in run_default_entrypoint)
• ...Other stuff...?

[sureshjoshi]

I updated Ruff to use 3.14, and it's just been a weird mess of sometimes-formatted, sometimes not formatted. The latest ruff modified our lambdas in help, and they look terrible

Here's the start. I accidentally wiped out the update to 0.15.2, so I need to re-add that as well.
https://github.com/sureshjoshi/pants/tree/update-ruff-python