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bors-servo f5a3d68513 Auto merge of #13930 - shinglyu:perf-llvmpipe, r=aneeshusa
Use headless rendering for performance test

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Properly set the software rendering environment variables and use `-z` to run the performance test in headless mode. Also changed some logging format to improve the readability and reduce log size.
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #13903 (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because need manual test

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