Skip playground test due to xctest issue

(cherry picked from commit a31a480)

Author: shahmishal

utils/build-presets.ini

@@ -374,6 +374,7 @@ 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
@@ -1345,6 +1346,7 @@ mixin-preset=
 
 # SKIP LLDB TESTS (67923799)
 skip-test-lldb
+skip-test-playgroundsupport
 
 [preset: buildbot_osx_package,use_os_runtime]
 mixin-preset=