ci(coverage): use taiki-e/install-action for cargo-tarpaulin

[nanotaboada]

Summary

• Replaces cargo install cargo-tarpaulin --version 0.35.2 --locked with taiki-e/install-action@v2.81.8 to download a pre-built binary instead of compiling from source
• Reduces coverage job runtime from ~5 minutes to seconds for the tarpaulin install step

Test plan

• Coverage job completes successfully with the pre-built binary
• Codecov report is still uploaded correctly

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 26699537-b246-4868-b5f9-fb23db35078a

📥 Commits

Reviewing files that changed from the base of the PR and between 119460e and 4856a64.

📒 Files selected for processing (2)

• .github/workflows/rust-ci.yml
• CHANGELOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/optimise-tarpaulin-install

• 🛠️ sync documentation
• 🛠️ enforce http error handling
• 🛠️ idiomatic review
• 🛠️ verify api contract

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.88%. Comparing base (42a1717) to head (4856a64).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   84.88%   84.88%           
=======================================
  Files           6        6           
  Lines         172      172           
=======================================
  Hits          146      146           
  Misses         26       26           

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