[CMake] Also treat builds in Playgrounds trains as "Xcode" builds. #40250
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These builds are meant to be as close to Xcode train builds as possible, so it
makes sense to treat them this way instead of letting them be treated as OS
builds or making a new kind of B&I build for them.
Playgrounds trains are identifiable via the
RC_PLAYGROUNDS
environmentvariable being set to
YES
; if that isn't set, then it's not a Playgroundstrain.
This addresses rdar://problem/85511438.