Update CHANGES.md for PR 37331

[shunping]

Add some notes to CHANGES.md regarding #37331.

[shunping]

r: @tvalentyn

[gemini-code-assist]

Summary of Changes

Hello @shunping, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the CHANGES.md file to document significant modifications related to Python's pip package management. It highlights the introduction of an experimental flag to control pip build isolation and explains the implications of the default build isolation behavior introduced with the upgrade to pip version 25.3, particularly concerning internet connectivity requirements during package installations.

Highlights

• Python Pip Build Isolation Control: An experiment flag has been added to allow users to disable pip build isolation, addressing potential issues in environments without internet access.
• Pip Version Upgrade Impact: The ensurepip utility now uses pip 25.3, which enables build isolation by default, requiring internet access for package installations and potentially causing timeout errors in offline environments.

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Changelog

• CHANGES.md
  • Added an entry under "New Features / Improvements" for the experiment flag to disable pip build isolation.
  • Added an entry explaining the impact of the pip version upgrade to 25.3, including default build isolation and potential internet access issues.

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[tvalentyn]

Suggested change

	* (Python) Added an experiment flag to disable pip build isolation ([#37331](https://github.com/apache/beam/issues/37331)).
	* (Python) Added a pipeline option `--experiments=pip_no_build_isolation` to disable build isolation when installing dependencies in the runtime environment ([#37331](https://github.com/apache/beam/issues/37331)).

[tvalentyn]

Suggested change

* (Python) The pip version used by ensurepip is upgraded to 25.3, which enables build isolation by default. As a result, pip needs internet access to download setuptools and set up an isolated virtual environment to build wheels when installing packages. If the user environment does not have internet access, it could lead to a timeout error. See ([#37331](https://github.com/apache/beam/pull/37331)) for more details.

* (Python) The pip version used by ensurepip is upgraded to 25.3, which enables build isolation by default. As a result, pip needs internet access to download setuptools and set up an isolated virtual environment to build wheels when installing packages. If the user environment does not have internet access, it could lead to a timeout error. See ([#37331](https://github.com/apache/beam/pull/37331)) for more details and workarounds.

[tvalentyn]

I also updated the wording there in the description, ptal.