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Since LLVM 17 has been branched and is on the verge of being released, we can drop the CI job that tests against Clang 15. I think the number of cherry-picks to `release/17.x` will be a lot smaller now, so keeping a Clang 15 job around for that purpose seems unnecessary. As a fly-by, this patch also removes some Clang 15 workarounds and test suite annotations as we usually do. It also removes some slightly older gcc test suite annotations that were missed.