Remove auto-detection of Python toolchain from MODULE.bazel

since it affects downstream users

The correct solution appears to be
https://rules-python.readthedocs.io/en/stable/toolchains.html#library-modules-with-dev-only-python-usage

This change also includes a workaround for the new mechanism creating
paths that are too long for Windows to handle.

Fixes #4581

PiperOrigin-RevId: 657706984
Change-Id: I8ae6b9e5efeb7629d79d14e7d4d3889876282d17

MODULE.bazel

@@ -49,11 +49,19 @@ bazel_dep(name = "re2",
           version = "2024-07-02")
 
 bazel_dep(name = "rules_python",
-          version = "0.29.0")
+          version = "0.34.0",
+          dev_dependency = True)
 
+# https://rules-python.readthedocs.io/en/stable/toolchains.html#library-modules-with-dev-only-python-usage
+python = use_extension(
+    "@rules_python//python/extensions:python.bzl",
+    "python",
+    dev_dependency = True
+)
+
+python.toolchain(python_version = "3.12",
+                 is_default = True,
+                 ignore_root_user_error = True)
 
 fake_fuchsia_sdk = use_repo_rule("//:fake_fuchsia_sdk.bzl", "fake_fuchsia_sdk")
 fake_fuchsia_sdk(name = "fuchsia_sdk")
-
-# https://github.com/bazelbuild/rules_python/blob/main/BZLMOD_SUPPORT.md#default-toolchain-is-not-the-local-system-python
-register_toolchains("@bazel_tools//tools/python:autodetecting_toolchain")