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test/cfg/runtests.sh: added support for include-what-you-use and integrated it with the CI / some refactoring
Successful iwyu run: https://github.com/danmar/cppcheck/actions/runs/12364137822.
Successful IWYU run: https://github.com/danmar/cppcheck/actions/runs/16077268956
Requires #7643 to be merged first.