Test crates workflow caching

[softmarshmallow]

Improve test-crates.yml cache reuse to reduce workflow execution time.

The previous rust-cache configuration frequently missed caches due to hashing Cargo files into the key, leading to long (30+ minute) run times. This change disables that hash, caches all workspace crates, and saves the cache on failure, allowing for better cache hit rates and faster subsequent runs.

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Summary by CodeRabbit

• Chores
  • Updated CI/CD caching configuration to optimize build performance and reliability.

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[coderabbitai]

Walkthrough

The test-crates GitHub Actions workflow was updated with three new cache configuration parameters for the Swatinem/rust-cache action: disabling the Rust environment hash key, enabling workspace crates caching, and enabling cache persistence on build failure.

Changes

Cohort / File(s)	Summary
GitHub Actions Cache Configuration .github/workflows/test-crates.yml	Added three new inputs to the rust-cache action: add-rust-environment-hash-key: false, cache-workspace-crates: true, and cache-on-failure: true, modifying cache computation and retention behavior.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A cache so swift, with settings refined,
No hash keys weighing down the bind,
Workspace crates all bundled tight,
Failure brings persistence's might!
Our builds now bounce with hoppy glee, ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: configuring caching in the test-crates workflow to improve cache reuse and reduce execution time.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/test-crates-workflow-caching-c815

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