Disable C++ interop test: std-span-transformed-execution.swift

rdar://147267918 (Fix CxxSpanReturnThunkBuilder to override the lifetime of the
CxxSpan)

@_unsafeNonescapableResult is now fixed so that _overrideLifetime is correctly
diagnosed. It only disables diagnostics within the function body. It should have
no effect on the caller's diagnostics.

Author: atrick

test/Interop/Cxx/stdlib/std-span-transformed-execution.swift

@@ -1,5 +1,8 @@
 // RUN: %target-run-simple-swift(-plugin-path %swift-plugin-dir -I %S/Inputs -Xfrontend -enable-experimental-cxx-interop -swift-version 6 -Xfrontend -disable-availability-checking -Xcc -std=c++20 -enable-experimental-feature LifetimeDependence -enable-experimental-feature SafeInteropWrappers)
 
+// Fix CxxSpanReturnThunkBuilder to use _overrideLifetime:
+// REQUIRES: rdar147267918
+
 // FIXME swift-ci linux tests do not support std::span
 // UNSUPPORTED: OS=linux-gnu