Revert "[mlir python] Add nanobind support for standalone dialects." (#118517)

Reverts llvm/llvm-project#117922 because deps aren't met on some of the
post-commit build bots.

Author: makslevental

DialectLLVM.cpp

@@ -6,13 +6,11 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <string>
-
 #include "mlir-c/Dialect/LLVM.h"
 #include "mlir-c/IR.h"
 #include "mlir-c/Support.h"
-#include "mlir/Bindings/Python/Diagnostics.h"
 #include "mlir/Bindings/Python/PybindAdaptors.h"
+#include <string>
 
 namespace py = pybind11;
 using namespace llvm;

TransformInterpreter.cpp

@@ -10,15 +10,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <pybind11/detail/common.h>
-#include <pybind11/pybind11.h>
-
 #include "mlir-c/Dialect/Transform/Interpreter.h"
 #include "mlir-c/IR.h"
 #include "mlir-c/Support.h"
-#include "mlir/Bindings/Python/Diagnostics.h"
 #include "mlir/Bindings/Python/PybindAdaptors.h"
 
+#include <pybind11/detail/common.h>
+#include <pybind11/pybind11.h>
+
 namespace py = pybind11;
 
 namespace {