Add Firefox support for Clang Static Analyzer backend

[zzjas]

Summary

• Adds Firefox target support to the CSA backend with scan-build integration
• Implements Firefox-specific checker validation and analysis methods
• Creates end-to-end test infrastructure for Firefox static analysis

Changes

• src/backends/csa.py: Added Firefox validation and analysis methods with scan-build integration
• src/targets/firefox.py: New Firefox target class with build configuration and compilation flag support
• src/tests/clang-firefox.cpp: Sample Firefox-specific checker for testing
• src/tests/test_firefox_e2e.py: Comprehensive end-to-end test suite

[gemini-code-assist]

Summary of Changes

Hello @zzjas, 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 significantly extends the capabilities of the Clang Static Analyzer backend by enabling it to perform static analysis on the Firefox browser's codebase. It provides the necessary infrastructure to define and execute custom checkers, manage Firefox's build environment, and interpret analysis results, ensuring a robust and testable integration for future static analysis efforts on Firefox.

Highlights

• Firefox Target Support: Added comprehensive support for Firefox as a target for the Clang Static Analyzer (CSA) backend, including integration with scan-build.
• Firefox-Specific Analysis: Implemented dedicated methods for validating and running custom checkers against the Firefox codebase, tailored to its build system and code patterns.
• End-to-End Testing: Introduced a new end-to-end test suite to verify the functionality of the Firefox static analysis integration, covering checker compilation, analysis execution, and result parsing.

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[gemini-code-assist]

Code Review

This pull request introduces support for static analysis of the Firefox codebase using the Clang Static Analyzer backend. The changes include a new Firefox target class to handle the specifics of the Firefox build system, new analysis and validation methods in csa.py that integrate with scan-build, and a comprehensive end-to-end test to validate the new functionality. The implementation is solid and the addition of an E2E test is excellent. My review comments focus on improving maintainability and robustness. Specifically, I've suggested removing hardcoded paths in favor of constants or properties, deleting an unused function, and refactoring the tests to rely on public APIs instead of private methods, which will make them less brittle to future implementation changes.