Refactor the sanity checking code, again #15092
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The goal is to reduce code duplication, and allow each language to implement as little as possible to get good checking. The main motivation is that half of the checks are fragile, as they add the work directory to the paths of the generated files they want to use. This works when run inside mesonmain because we always have an absolute build directory, but when put into run_project_tests.py it doesn't work because that gives a relative build directory. Additionally, this fixes the implementation of sanity checking for transpiled langauges like Vala and Cython, which previously didn't test the output of their compilers at all, but re-ran the C compiler test for itself.
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This time, without regressions, hopefully.
The goal here remains the same, get more robust checking for all compiler classes with less code per class. I've folding up review from the previous attempt (which I don't think GitHub will let me reopen), as well as additional changes.
One of the things I discovered after reverting the last attempt is that transpiled languages aren't being tested at all, only the actual compiler is being tested, without the output from the transpiler. So in the Vala cases this means that C gets called with the C implementation's code, and then we call it good. This obviously isn't good, this is bad. For Vala this is a pretty straightforward fix. For Cython this is proving more difficult, especially for me who doesn't have a lot of experience with compiled Python modules.
This is marked as draft as there's still issues here to be solved, particularly around Cython. This also doesn't have the code that adds checking for Assembly.