chore: make builtin build_python_zip flag optional for tests (bazel 10 compatibility)

[rickeylev]

Starting in bazel 10, the build_python_zip flag is removed. This means using
the flag in e.g. transitions no longer works, which breaks some of the tests
that set the flag for testing.

To fix, don't set the flags or add them to transitions when running under
bazel 10.

Fixes #3496

[gemini-code-assist]

Summary of Changes

Hello @rickeylev, 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 project to maintain compatibility with Bazel 10 by making the build_python_zip flag optional in test configurations and transitions. The changes ensure that tests continue to pass without errors in newer Bazel environments where this flag is no longer supported, while still functioning correctly in older versions.

Highlights

• Bazel 10 Compatibility: The pull request addresses compatibility issues with Bazel 10, where the build_python_zip flag has been removed, causing existing tests to fail.
• Conditional Flag Usage: Introduced a mechanism to conditionally apply the build_python_zip flag in tests and transitions, ensuring it is only used when running on Bazel versions prior to 10.
• Bazel Version Detection: Added bazel_10_or_later to the internal configuration, allowing rules to dynamically adapt their behavior based on the detected Bazel version.

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[gemini-code-assist]

Code Review

This pull request updates the build configuration and tests to be compatible with Bazel 10, where the build_python_zip flag is removed. The changes correctly introduce a bazel_10_or_later configuration flag and use it to conditionally apply the build_python_zip flag in tests and transitions. My review includes a couple of suggestions to improve code consistency and clarity for better long-term maintainability.