chore(internal/librarian/rust): remove unused function

[zhumin8]

Removes getPackageName that retrieves the packagename from a Cargo.toml file. It is never used other than test.

For #3203

[gemini-code-assist]

Summary of Changes

Hello @zhumin8, 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 focuses on code hygiene by eliminating an unused function and its related dependencies and tests within the internal/librarian/rust package. The getPackageName function was identified as dead code, only being used in its own test, and its removal simplifies the codebase and reduces the overall dependency footprint without impacting functionality.

Highlights

• Code Removal: The getPackageName function, which was responsible for extracting the package name from a Cargo.toml file, has been entirely removed from internal/librarian/rust/helper.go.
• Dependency Cleanup: Associated unused imports, specifically the os package and the github.com/pelletier/go-toml/v2 library, have been removed from internal/librarian/rust/helper.go.
• Test Removal: The TestGetPackageName unit test in internal/librarian/rust/helper_test.go has been removed, as the function it tested no longer exists.

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[gemini-code-assist]

Code Review

This pull request correctly removes the unused getPackageName function and its associated test, which is a good code cleanup. I've added one comment suggesting the removal of related data structures that are now also unused as a result of this change.

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internal/librarian/rust/helper.go (48-60)

Good catch removing this unused function. With getPackageName gone, the structs CargoConfig and CargoPackage defined on lines 101-108 are no longer used and should also be removed to complete the code cleanup.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.43%. Comparing base (07dd3ac) to head (6de155d).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3306      +/-   ##
==========================================
+ Coverage   80.41%   80.43%   +0.01%     
==========================================
  Files         163      163              
  Lines       13773    13764       -9     
==========================================
- Hits        11076    11071       -5     
+ Misses       2120     2118       -2     
+ Partials      577      575       -2     

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