refactor: Migrate usages of `py_internal.cc_helper` to `@rules_cc`

[hvadehra]

The builtins symbols are deleted in Bazel 9

[gemini-code-assist[bot]]

Summary of Changes

Hello @hvadehra, I'm Gemini Code Assist[^1]! 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 undertakes a significant refactoring effort to update the Bazel build configuration by transitioning from an internal cc_helper implementation to the standard one provided by the @rules_cc repository. This change is crucial for maintaining compatibility with upcoming Bazel 9 releases, which will deprecate and remove certain built-in symbols. The modifications involve updating build file dependencies and Starlark load statements to correctly reference the external rules_cc modules, ensuring the build system remains robust and forward-compatible.

Highlights

• Migration to @rules_cc: The pull request migrates all usages of an internal py_internal.cc_helper module to the official @rules_cc repository's cc_helper and find_cc_toolchain functionalities. This ensures compatibility with Bazel 9, which removes certain built-in symbols.
• Removal of Internal cc_helper: The internal cc_helper.bzl file and its corresponding bzl_library definition in python/private/BUILD.bazel have been removed, streamlining the build configuration.
• Dependency and Load Statement Updates: Various BUILD.bazel and .bzl files have been updated to reflect the new external dependencies, changing load statements and deps to point to @rules_cc modules instead of internal ones.
• Function Call Refactoring: The py_executable.bzl file now directly calls find_cc_toolchain(ctx) from @rules_cc instead of accessing it via cc_helper.find_cpp_toolchain(ctx), aligning with the external module's API.

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