Ensure prebuilt Modules include path added to generated modules #8485
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For Windows and Linux, SwiftPM generates modules for test discovery and the test entry point. When testing macro targets, we add the swift-syntax prebuilt Modules directory to the include path for the test target. We also need to do this for the generated modules.
As a side effect, this also adds all include directories to the include path for these generated modules to ensure they build for other use cases that may need this.