wip: target_platforms fixup

[aignas]

WIP: Simple behaviour fixup for default values.

• fixup the target_platform setting and test locally
• fixup

[gemini-code-assist[bot]]

Summary of Changes

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This pull request focuses on refining the target_platforms configuration within the Bazel build system, particularly for Python-related dependencies and documentation builds. The changes ensure that default platform settings are applied consistently, addressing a 'work in progress' fixup for behavior related to these default values.

Highlights

• Platform Configuration for dev_pip: The dev_pip extension in MODULE.bazel now explicitly defines target_platforms to include both generic OS/architecture and freethreaded variants, ensuring consistent platform setup for Python dependencies.
• Documentation Build Settings: The sphinx_build_binary rule in docs/BUILD.bazel has been updated to include PY_FREETHREADED and set PYTHON_VERSION to '3.14' within its config_settings, affecting how documentation is built.
• Dynamic target_platforms Defaulting: The _pip_parse function in python/private/pypi/hub_builder.bzl now includes revised logic for target_platforms, defaulting to ["{os}_{arch}"] if pip_attr.target_platforms is not provided and default_cross_setup is false, otherwise using an empty list. This clarifies default behavior for platform targeting.

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