[bazel] Use rules_python load statements (#113213)

With bazel 8.x these are strongly encouraged, and this disambiguates
which version of these rules we get for older versions. Specifically the
native.py_test was using the wrong version of py_test.

Author: keith

utils/bazel/llvm-project-overlay/clang/BUILD.bazel

@@ -2,6 +2,7 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+load("@rules_python//python:defs.bzl", "py_binary")
 load(
     "//:vars.bzl",
     "LLVM_VERSION_MAJOR",

utils/bazel/llvm-project-overlay/lldb/BUILD.bazel

@@ -6,6 +6,7 @@ load("@bazel_skylib//lib:selects.bzl", "selects")
 load("@bazel_skylib//rules:common_settings.bzl", "bool_flag")
 load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
 load("@build_bazel_apple_support//rules:apple_genrule.bzl", "apple_genrule")
+load("@rules_python//python:defs.bzl", "py_binary")
 load("//:vars.bzl", "LLVM_VERSION_MAJOR", "LLVM_VERSION_MINOR", "LLVM_VERSION_PATCH", "LLVM_VERSION_SUFFIX", "PACKAGE_VERSION")
 load("//lldb/source/Plugins:plugin_config.bzl", "DEFAULT_PLUGINS", "DEFAULT_SCRIPT_PLUGINS", "OBJCPP_COPTS")
 load("//mlir:tblgen.bzl", "gentbl_cc_library", "td_library")

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

@@ -4,6 +4,7 @@
 
 load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
 load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
+load("@rules_python//python:defs.bzl", "py_binary")
 load("//mlir:tblgen.bzl", "td_library")
 load(":binary_alias.bzl", "binary_alias")
 load(":config.bzl", "llvm_config_defines")

utils/bazel/llvm-project-overlay/llvm/lit_test.bzl

@@ -4,6 +4,7 @@
 """Rules for running lit tests."""
 
 load("@bazel_skylib//lib:paths.bzl", "paths")
+load("@rules_python//python:defs.bzl", "py_test")
 
 def lit_test(
         name,
@@ -29,8 +30,7 @@ def lit_test(
     args = args or []
     data = data or []
     deps = deps or []
-
-    native.py_test(
+    py_test(
         name = name,
         srcs = [Label("//llvm:lit")],
         main = Label("//llvm:utils/lit/lit.py"),