[lldb] Revert scripted symbol locator (#181945)

This revert #181334 and its follow-up PRs (including #181488, #181492,
#181493, #181494 and #181498) as well as Ismail's documentation changes
(#181594, #181717). The original commit causes a test failure in CI
(https://github.com/llvm/llvm-project/issues/181938) but the more I look
at the patch, the more I'm convinced it was not ready to land. It will
be easier to iterate on the feedback by re-landing this than by using
post-commit review.

lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h

@@ -104,9 +104,6 @@ public:
   lldb::ScriptedFrameProviderInterfaceSP
   CreateScriptedFrameProviderInterface() override;
 
-  lldb::ScriptedSymbolLocatorInterfaceSP
-  CreateScriptedSymbolLocatorInterface() override;
-
   lldb::ScriptedThreadPlanInterfaceSP
   CreateScriptedThreadPlanInterface() override;