[WIP] Use prebuilts for all targets that build for destination == host. #9499
+543
−317
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Add a hidden HostCondition that will check the build parameters to see if we're building a target for host enable the include and link settings to use the prebuilts and disable the dependency on swift-syntax products.
Doesn't support SwiftBuild yet. Need to figure out how to use the same condition there.
Also cleaned up BuildPlanTests so they are just Native BuildPlan tests as designed and created a separate BuildTests for the two tests that used the build system kind setting.