[test][sanitizer] Allow fork_threaded test on Msan, Tsan, Ubsan (#75260)

They already include workarounds.

Author: vitalybuka

compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp

@@ -1,6 +1,6 @@
 // RUN: %clangxx -O0 %s -o %t && %env_tool_opts=die_after_fork=0 %run %t
 
-// UNSUPPORTED: asan, hwasan, lsan, msan, tsan, ubsan
+// UNSUPPORTED: asan, lsan, hwasan
 
 // Forking in multithread environment is unsupported. However we already have
 // some workarounds, and will add more, so this is the test.