Unconditionally add the testing macro plugin subdirectory to compile actions. #1559
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Xcode 26.0 beta 5 has isolated this plugin to its own subdirectory and Xcode only passes it to the compiler when building test targets (previous versions had a symlink to make the default path work, but beta 5 removed that symlink). We don't want to make that distinction in our rules, so it's fine to just unconditionally pass it.
Cherry pick: 15da0d2eadfbfedf8b673b5eb0903080c35111e1