[lldb][test] Disable TestMultipleDebuggers on Linux

This used to timeout (#101162)
now it's aborting (#105765 (comment))

Author: DavidSpickett

lldb/test/API/api/multiple-debuggers/TestMultipleDebuggers.py

@@ -13,6 +13,7 @@ class TestMultipleSimultaneousDebuggers(TestBase):
     NO_DEBUG_INFO_TESTCASE = True
 
     # Sometimes times out on Linux, see https://github.com/llvm/llvm-project/issues/101162.
+    @skipIfLinux
     @skipIfNoSBHeaders
     @skipIfWindows
     @skipIfHostIncompatibleWithTarget