[cxx-interop] Disable failing tests to unblock nightly toolchains

rdar://93341210

Author: egorzhdan

test/Interop/Cxx/stdlib/libstdcxx-module-interface.swift

@@ -9,6 +9,7 @@
 
 // This test is specific to libstdc++ and only runs on platforms where libstdc++ is used.
 // REQUIRES: OS=linux-gnu
+// REQUIRES: rdar93341210
 
 // CHECK-STD: enum std {
 // CHECK-STRING:   struct {{__CxxTemplateInstNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE|__CxxTemplateInstSs}} {

test/Interop/Cxx/stdlib/use-std-string.swift

@@ -4,6 +4,7 @@
 //
 // Enable this everywhere once we have a solution for modularizing other C++ stdlibs: rdar://87654514
 // REQUIRES: OS=macosx || OS=linux-gnu
+// REQUIRES: rdar93341210
 
 import StdlibUnittest
 import StdString