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Closes #19838

There is a problem when CI determines which runners it needs when testing formulae. If a formula has on_linux do block with depends_on arch: requirement, it'll be added to formula.requirements list, even if there's no such restriction on macOS. The opposite problem happens with on_macos block. Because CI runs on Linux, it is not able to check depends_on arch: there. To solve this problem, we need to simulate the specific platform when sending #{arch}_compatible? request.

Unfortunately, I don't know how to check if it works (I didn't find how to test on_* block in github_runner_matrix_spec.rb), but I hope it will work as expected