[lldb][test] Disable TestDAP_startDebugging.py on Windows

It is flakey lately on our Windows on Arm bot:
https://lab.llvm.org/buildbot/#/builders/141/builds/11169

======================================================================

ERROR: test_startDebugging (TestDAP_startDebugging.TestDAP_startDebugging.test_startDebugging)

   Tests the "startDebugging" reverse request. It makes sure that the IDE can

----------------------------------------------------------------------

Traceback (most recent call last):

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\lldbtest.py", line 2067, in tearDown

    Base.tearDown(self)

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\lldbtest.py", line 1105, in tearDown

    hook()  # try the plain call and hope it works

    ^^^^^^

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\tools\lldb-dap\lldbdap_testcase.py", line 518, in cleanup

    self.dap_server.terminate()

  File "C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\tools\lldb-dap\dap_server.py", line 1593, in terminate

    raise DebugAdapterProcessError(process.returncode)

dap_server.DebugAdapterProcessError: lldb-dap returned non-zero exit status 1.

Config=aarch64-C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe

----------------------------------------------------------------------

See https://github.com/llvm/llvm-project/issues/137660.

I am aware that I am disabling these tests with little thought, and I would
like to be more careful with it but I don't have the knowledge to really
debug these issues.

Having buildbot results we can properly triage is more important to
me personally than finding whatever the underlying issue is. I'm sure
DAP experts will figure it out eventually.