refactor: remove is_bazel_6_4_or_higher

Author: aignas

python/private/BUILD.bazel

@@ -264,7 +264,6 @@ bzl_library(
         ":pythons_hub_bzl",
         ":repo_utils_bzl",
         ":toolchains_repo_bzl",
-        ":util_bzl",
         ":version_bzl",
         "@bazel_features//:features",
     ],

python/private/python.bzl

@@ -29,7 +29,6 @@ load(
     "sorted_host_platform_names",
     "sorted_host_platforms",
 )
-load(":util.bzl", "IS_BAZEL_6_4_OR_HIGHER")
 load(":version.bzl", "version")
 
 def parse_modules(*, module_ctx, logger, _fail = fail):
@@ -932,14 +931,6 @@ def _create_toolchain_attrs_struct(*, tag = None, python_version = None, toolcha
         ignore_root_user_error = getattr(tag, "ignore_root_user_error", True),
     )
 
-def _get_bazel_version_specific_kwargs():
-    kwargs = {}
-
-    if IS_BAZEL_6_4_OR_HIGHER:
-        kwargs["environ"] = ["RULES_PYTHON_BZLMOD_DEBUG"]
-
-    return kwargs
-
 _defaults = tag_class(
     doc = """Tag class to specify the default Python version.""",
     attrs = {
@@ -1356,7 +1347,7 @@ python = module_extension(
         "single_version_platform_override": _single_version_platform_override,
         "toolchain": _toolchain,
     },
-    **_get_bazel_version_specific_kwargs()
+    environ = ["RULES_PYTHON_BZLMOD_DEBUG"],
 )
 
 _DEBUG_BUILD_CONTENT = """

python/private/util.bzl

@@ -73,16 +73,3 @@ def add_tag(attrs, tag):
 IS_BAZEL_7_4_OR_HIGHER = hasattr(native, "legacy_globals")
 
 IS_BAZEL_7_OR_HIGHER = hasattr(native, "starlark_doc_extract")
-
-_marker_rule_to_detect_bazel_6_4_or_higher = rule(implementation = lambda ctx: None)
-
-# Bazel 6.4 and higher have a bug fix where rule names show up in the str()
-# of a rule. See
-# https://github.com/bazelbuild/bazel/commit/002490b9a2376f0b2ea4a37102c5e94fc50a65ba
-# https://github.com/bazelbuild/bazel/commit/443cbcb641e17f7337ccfdecdfa5e69bc16cae55
-# This technique is done instead of using native.bazel_version because,
-# under stardoc, the native.bazel_version attribute is entirely missing, which
-# prevents doc generation from being able to correctly generate docs.
-IS_BAZEL_6_4_OR_HIGHER = "_marker_rule_to_detect_bazel_6_4_or_higher" in str(
-    _marker_rule_to_detect_bazel_6_4_or_higher,
-)