fix: Mark toolchain repo rule as reproducible

[mortenmj]

This allows the content produced by the repo rule to be fetched from the remote repo contents cache.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the build system's efficiency by marking a specific toolchain repository rule as reproducible. This change facilitates the use of remote caching for the rule's generated content, leading to faster and more consistent builds by avoiding redundant fetches and computations, while also maintaining compatibility with older Bazel versions.

Highlights

• Toolchain Reproducibility: Marked the structure_test_repositories rule as reproducible by returning repository_ctx.repo_metadata(reproducible = True) from its implementation function.
• Remote Caching Enhancement: Enabled the content generated by this repository rule to be fetched from the remote repository contents cache, improving build efficiency.
• Bazel Version Compatibility: Implemented a check for the existence of repository_ctx.repo_metadata to ensure compatibility with Bazel versions older than 8.3.0.

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Changelog

• repositories.bzl
  • Added logic to mark the structure_test_repositories rule as reproducible.
  • Included a compatibility check for repository_ctx.repo_metadata for older Bazel versions.

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[gemini-code-assist]

Code Review

This pull request updates the _structure_test_repo_impl repository rule to be reproducible, which will improve remote caching. The change correctly uses repository_ctx.repo_metadata(reproducible = True) while maintaining backward compatibility with older Bazel versions via a hasattr check. The implementation is sound and follows Bazel best practices.