ci update llvmpipe

[nihui]

No description provided.

[Copilot]

Pull Request Overview

A PR to update the CI configuration for test coverage by replacing the lavapipe job with a new llvmpipe job.

• Added a "linux-gcc-gpu-llvmpipe" job in the GitHub workflow to build, test, and collect coverage data using llvmpipe.
• Removed the legacy "linux-gcc-gpu-lavapipe" job from the CI configuration.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/test-coverage.yml	Added new job for llvmpipe testing and coverage collection.
.ci/test-coverage.yml	Removed legacy lavapipe testing job from the CI configuration.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.33%. Comparing base (ad30c7f) to head (85e07e6).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/net.cpp	33.33%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5954       +/-   ##
===========================================
- Coverage   95.52%   95.33%    -0.19%     
===========================================
  Files         406      819      +413     
  Lines      110478   268443   +157965     
===========================================
+ Hits       105532   255930   +150398     
- Misses       4946    12513     +7567     

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