Revert "Remove some raciness from the TestProcessAttach.test_run_then_attach_wait_interrupt"

This reverts commit df93c4f.
This change is breaking the LLDB CI builders, e.g.
https://lab.llvm.org/buildbot/#/builders/68/builds/60350

Author: mysterymath

lldb/test/API/commands/process/attach/TestProcessAttach.py

@@ -4,8 +4,6 @@
 
 
 import os
-import threading
-import time
 import lldb
 import shutil
 from lldbsuite.test.decorators import *
@@ -130,84 +128,3 @@ def tearDown(self):
 
         # Call super's tearDown().
         TestBase.tearDown(self)
-                
-    def test_run_then_attach_wait_interrupt(self):
-        # Test that having run one process doesn't cause us to be unable
-        # to interrupt a subsequent attach attempt.
-        self.build()
-        exe = self.getBuildArtifact(exe_name)
-
-        target = lldbutil.run_to_breakpoint_make_target(self, exe_name, True)
-        launch_info = target.GetLaunchInfo()
-        launch_info.SetArguments(["q"], True)
-        error = lldb.SBError()
-        target.Launch(launch_info, error)
-        self.assertSuccess(error, "Launched a process")
-        self.assertState(target.process.state, lldb.eStateExited, "and it exited.") 
-        
-        # Okay now we've run a process, try to attach/wait to something
-        # and make sure that we can interrupt that.
-        
-        options = lldb.SBCommandInterpreterRunOptions()
-        options.SetPrintResults(True)
-        options.SetEchoCommands(False)
-
-        self.stdin_path = self.getBuildArtifact("stdin.txt")
-
-        with open(self.stdin_path, "w") as input_handle:
-            input_handle.write("process attach -w -n noone_would_use_this_name\nquit")
-
-        # Python will close the file descriptor if all references
-        # to the filehandle object lapse, so we need to keep one
-        # around.
-        self.filehandle = open(self.stdin_path, "r")
-        self.dbg.SetInputFileHandle(self.filehandle, False)
-
-        # No need to track the output
-        self.stdout_path = self.getBuildArtifact("stdout.txt")
-        self.out_filehandle = open(self.stdout_path, "w")
-        self.dbg.SetOutputFileHandle(self.out_filehandle, False)
-        self.dbg.SetErrorFileHandle(self.out_filehandle, False)
-
-        n_errors, quit_req, crashed = self.dbg.RunCommandInterpreter(
-            True, True, options, 0, False, False)
-        
-        while 1:
-            time.sleep(1)
-            if target.process.state == lldb.eStateAttaching:
-                break
-
-        self.dbg.DispatchInputInterrupt()
-        self.dbg.DispatchInputInterrupt()
-
-        # cycle waiting for the process state to change before trying
-        # to read the command output.  I don't want to spin forever.
-        counter = 0
-        got_exit = False
-        while counter < 20:
-            if target.process.state == lldb.eStateExited:
-                got_exit = True
-                break
-            counter += 1
-            time.sleep(1)
-
-        self.assertTrue(got_exit, "The process never switched to eStateExited")
-        # Even if the state has flipped, we still need to wait for the
-        # command to complete to see the result.  We don't have a way to
-        # synchronize on "command completed" right now, but sleeping just
-        # a bit should be enough, all that's left is passing this error
-        # result to the command, and printing it to the debugger output.
-        time.sleep(1)
-
-        self.out_filehandle.flush()
-        reader = open(self.stdout_path, "r")
-        results = reader.readlines()
-        found_result = False
-        for line in results:
-            if "Cancelled async attach" in line:
-                found_result = True
-                break
-        if not found_result:
-            print(f"Results: {results}")
-
-        self.assertTrue(found_result, "Found async error in results")