[bazel] rename python runtime to py39 runtime (#58362)

and move them into bazel dir.
getting ready for python version upgrade

Signed-off-by: Lonnie Liu <lonnie@anyscale.com>

Author: aslonnie

BUILD.bazel

@@ -9,12 +9,11 @@
 load("@bazel_skylib//rules:common_settings.bzl", "bool_flag")
 load("@com_github_grpc_grpc//bazel:cython_library.bzl", "pyx_library")
 load("@hedron_compile_commands//:refresh_compile_commands.bzl", "refresh_compile_commands")
-load("@python3_9//:defs.bzl", python39 = "interpreter")
 load("@rules_cc//cc:defs.bzl", "cc_proto_library")
 load("@rules_pkg//pkg:mappings.bzl", "pkg_attributes", "pkg_files")
 load("@rules_pkg//pkg:zip.bzl", "pkg_zip")
 load("@rules_proto//proto:defs.bzl", "proto_library")
-load("@rules_python//python:defs.bzl", "py_binary", "py_library", "py_runtime", "py_runtime_pair")
+load("@rules_python//python:defs.bzl", "py_binary", "py_library")
 load("//bazel:ray.bzl", "COPTS", "PYX_COPTS", "PYX_SRCS", "ray_cc_library")
 
 package(
@@ -23,34 +22,13 @@ package(
 
 # Hermetic python environment, currently only used for CI infra and scripts.
 
-py_runtime(
-    name = "python3_runtime",
-    interpreter = python39,
-    python_version = "PY3",
-    visibility = ["//visibility:private"],
-)
-
-py_runtime_pair(
-    name = "python_runtime_pair",
-    py2_runtime = None,
-    py3_runtime = ":python3_runtime",
-    visibility = ["//visibility:private"],
-)
-
 constraint_setting(name = "hermetic")
 
 constraint_value(
     name = "hermetic_python",
     constraint_setting = ":hermetic",
 )
 
-toolchain(
-    name = "python_toolchain",
-    exec_compatible_with = [":hermetic_python"],
-    toolchain = ":python_runtime_pair",
-    toolchain_type = "@bazel_tools//tools/python:toolchain_type",
-)
-
 platform(
     name = "hermetic_python_platform",
     constraint_values = [":hermetic_python"],

WORKSPACE

@@ -83,7 +83,7 @@ load("@py_deps_buildkite//:requirements.bzl", install_py_deps_buildkite = "insta
 
 install_py_deps_buildkite()
 
-register_toolchains("//:python_toolchain")
+register_toolchains("//bazel:py39_toolchain")
 
 register_execution_platforms(
     "@local_config_platform//:host",

bazel/BUILD.bazel

@@ -1,5 +1,6 @@
+load("@python3_9//:defs.bzl", python39 = "interpreter")
 load("@py_deps_buildkite//:requirements.bzl", ci_require = "requirement")
-load("@rules_python//python:defs.bzl", "py_binary", "py_library")
+load("@rules_python//python:defs.bzl", "py_binary", "py_library", "py_runtime", "py_runtime_pair")
 
 exports_files([
     "pytest_wrapper.py",
@@ -60,3 +61,24 @@ config_setting(
         "@platforms//cpu:x86_64",
     ],
 )
+
+py_runtime(
+    name = "py39_runtime",
+    interpreter = python39,
+    python_version = "PY3",
+    visibility = ["//visibility:private"],
+)
+
+py_runtime_pair(
+    name = "py39_runtime_pair",
+    py2_runtime = None,
+    py3_runtime = ":py39_runtime",
+    visibility = ["//visibility:private"],
+)
+
+toolchain(
+    name = "py39_toolchain",
+    exec_compatible_with = ["//:hermetic_python"],
+    toolchain = ":py39_runtime_pair",
+    toolchain_type = "@bazel_tools//tools/python:toolchain_type",
+)