Add option to customize expected rustc exit code for compile tests #296
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Since Rust 1.81 rustc now aborts when lints report errors, meaning the exit code is 101.
This is causing the compile tests of the custom crown linter in the servo project to fail (See discussion in servo/servo#34270).
Allowing the user to specify a custom exit code, allows custom linter authors to override the expected error code.
Fixes #295