[lldb] Disable TestDAP_attach

This is also flaky. See https://github.com/llvm/llvm-project/issues/137660

lldb/test/API/tools/lldb-dap/attach/TestDAP_attach.py

@@ -25,6 +25,7 @@ def spawn_and_wait(program, delay):
     process.wait()
 
 
+@skipIf
 class TestDAP_attach(lldbdap_testcase.DAPTestCaseBase):
     def set_and_hit_breakpoint(self, continueToExit=True):
         source = "main.c"