Skip playground test due to xctest issue

Author: shahmishal

utils/build-presets.ini

@@ -375,6 +375,7 @@ swiftevolve
 
 # Build Playground support
 playgroundsupport
+skip-test-playgroundsupport
 
 # Only run OS X tests to make the build cycle faster.
 # We still build the iOS standard library though -- it is free given the
@@ -1347,6 +1348,7 @@ mixin-preset=
 skip-test-lldb
 # SKIP SWIFT-DOCC TESTS (87784021)
 skip-test-swiftdocc
+skip-test-playgroundsupport
 
 [preset: buildbot_osx_package,use_os_runtime]
 mixin-preset=