clean: Remove uses of native C++ implementation

[comius]

All uses need to be through rules_cc, because C++ will be removed from Bazel.

[gemini-code-assist]

Summary of Changes

Hello @comius, 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 removes the cc_helper.bzl file. This change is motivated by the upcoming removal of native C++ support in Bazel, necessitating the use of rules_cc for all C++ related functionalities.

Highlights

• Removal of cc_helper.bzl: The file python/private/cc_helper.bzl has been removed.
• Reason for Removal: The removal is part of an effort to ensure all C++ usage goes through rules_cc, as native C++ support will be removed from Bazel.

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[gemini-code-assist]

Code Review

This pull request removes the python/private/cc_helper.bzl file, which was an adapter for accessing Bazel's internal native C++ implementation. This change aligns with the stated goal of migrating to rules_cc as native C++ support is being removed from Bazel. The change is a simple and clean file deletion. Based on the provided context, the file appears to be unused, so its removal is appropriate.

[aignas]

This is related to #3367