Disable build isolation for pip by default in boot.go of Python containers

[shunping]

Users can re-enable it by using experiment "pip_use_build_isolation"

See https://lists.apache.org/thread/cqpkp8h2clqkj1jd0vtgc4fxocxytfvy for context and discussion.

[shunping]

r: @damccorm

[gemini-code-assist]

Summary of Changes

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This pull request modifies the default configuration for pip package installation within Python containers to disable build isolation. This change is intended to streamline the installation process and address common dependency resolution issues, while maintaining backward compatibility for users who specifically require build isolation through the newly introduced experiment flag.

Highlights

• Default behavior change: Updated the Python container boot process to disable pip build isolation by default.
• Experiment flag update: Replaced the previous opt-out flag with a new opt-in experiment flag, pip_use_build_isolation, to allow users to re-enable build isolation when necessary.

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[gemini-code-assist]

Code Review

This pull request changes the default behavior of pip's build isolation in the Python SDK container boot process. It switches the default to disabling build isolation (pipNoBuildIsolation = true) unless the experiment pip_use_build_isolation is explicitly specified. The reviewer suggested simplifying the assignment logic for pipNoBuildIsolation to improve readability and eliminate redundant assignments.

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[damccorm]

Thanks!