[LLDB] Skip TestGuiBasicDebug.py on Arm/AArch64 Linux

TestGuiBasicDebug.py randomly fails due to timeouts sending out false
negatives on LLDB Arm and AArch64 Linux buildbots. I havnt found a
reliable wayy to set pexpect timeout for this test to pass regularly.

Skipping it on Arm and AArch64 Linux to silence buildbot failures.