Avoid cloning live dev venv for yaml expansion in CI

[aIbrahiim]

PreCommit / YAML external-provider tests can build a dedicated expansion venv via clonevirtualenv so for .dev builds, Beam can use the interpreter’s venv root as the clone source and in CI that is often the active tox/sandbox environment, which is still being written to, so cloning can race on ephemeral paths (tmp/, caches, etc.).

#37989 (comment)

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[gemini-code-assist]

Summary of Changes

Hello, 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 improves the reliability of YAML provider virtual environment creation in CI pipelines. By disabling the cloning of the active development environment when running in CI, it prevents file system race conditions associated with temporary paths and caches, while preserving existing behavior for local development.

Highlights

• CI Environment Optimization: Modified the virtual environment cloning logic to prevent cloning the active development environment during CI runs, avoiding potential race conditions with ephemeral paths.
• Conditional Logic: Introduced a check for the 'CI' environment variable to ensure that the optimization only applies to CI environments while maintaining local development performance.

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R: @damccorm for label python.

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[damccorm]

Thanks!