Revert "[lldb] Make use of Scripted{Python,}Interface for ScriptedThreadPlan (Reland #70392)" (#93153)

Reverts llvm/llvm-project#93149 since it breaks
https://lab.llvm.org/buildbot/#/builders/68/builds/74799

lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPlatformPythonInterface.cpp

@@ -20,8 +20,6 @@
 #include "../ScriptInterpreterPythonImpl.h"
 #include "ScriptedPlatformPythonInterface.h"
 
-#include "lldb/Target/ExecutionContext.h"
-
 using namespace lldb;
 using namespace lldb_private;
 using namespace lldb_private::python;