[lldb][test] Skip TestLaunchProcessPosixSpawn.py
Fails on public green dragon arm64 bot with:
```
08:53:39 "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/./bin/dsymutil" -o "fat.out.dSYM" "fat.out"
08:53:39 warning: no debug symbols in executable (-arch x86_64)
08:53:39 warning: no debug symbols in executable (-arch x86_64h)
08:53:39 warning: no debug symbols in executable (-arch arm64)
08:53:39
08:53:39
08:53:39 runCmd: file -arch x86_64 /Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/lldb-test-build.noindex/macosx/posix_spawn/TestLaunchProcessPosixSpawn.test_apple_silicon/fat.out
08:53:39
08:53:39 warning: (x86_64) /Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/lldb-test-build.noindex/macosx/posix_spawn/TestLaunchProcessPosixSpawn.test_apple_silicon/fat.out empty dSYM file detected, dSYM was created with an executable with no debug info.
08:53:39 output: Current executable set to '/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/lldb-test-build.noindex/macosx/posix_spawn/TestLaunchProcessPosixSpawn.test_apple_silicon/fat.out' (x86_64).
08:53:39
08:53:39
08:53:39 <bound method SBProcess.Kill of SBProcess: pid = 73406, state = exited, threads = 0, executable = fat.out>: success
08:53:39
08:53:39 FAIL: LLDB (/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang-arm64) :: test_apple_silicon (TestLaunchProcessPosixSpawn.TestLaunchProcessPosixSpawn)
08:53:39 runCmd: settings clear --all
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set symbols.enable-external-lookup false
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set target.inherit-tcc true
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set target.disable-aslr false
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set target.detach-on-error false
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set target.auto-apply-fixits false
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set plugin.process.gdb-remote.packet-timeout 60
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set symbols.clang-modules-cache-path "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/lldb-test-build.noindex/module-cache-lldb/lldb-api"
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set use-color false
08:53:39
08:53:39 output:
08:53:39
08:53:39 runCmd: settings set show-statusline false
08:53:39
08:53:39 output:
08:53:39
08:53:39 UNSUPPORTED: LLDB (/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang-arm64) :: test_haswell (TestLaunchProcessPosixSpawn.TestLaunchProcessPosixSpawn) (Current CPU is not Haswell)
08:53:39 Restore dir to: /Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/tools/lldb/test
08:53:39 ======================================================================
08:53:39 FAIL: test_apple_silicon (TestLaunchProcessPosixSpawn.TestLaunchProcessPosixSpawn)
08:53:39 ----------------------------------------------------------------------
08:53:39 Traceback (most recent call last):
08:53:39 File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 160, in wrapper
08:53:39 return func(*args, **kwargs)
08:53:39 File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/macosx/posix_spawn/TestLaunchProcessPosixSpawn.py", line 72, in test_apple_silicon
08:53:39 self.run_arch(exe, "x86_64")
08:53:39 File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/macosx/posix_spawn/TestLaunchProcessPosixSpawn.py", line 48, in run_arch
08:53:39 self.assertTrue(error.Success(), str(error))
08:53:39 AssertionError: False is not true : error: process exited with status -1 (lost connection)
08:53:39 Config=arm64-/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang
08:53:39 ----------------------------------------------------------------------
08:53:39 Ran 2 tests in 5.686s
08:53:39
08:53:39 FAILED (failures=1, skipped=1)
```
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