revert the exec_tools changes

Author: aignas

CHANGELOG.md

@@ -54,8 +54,8 @@ Unreleased changes template.
 {#v0-0-0-changed}
 ### Changed
 * (toolchain) The `exec` configuration toolchain now has the forwarded
-  `py3_runtime` field from the `target` configuration toolchain. This is for
-  increased compatibility with the `RBE` setups where access to the `exec`
+  `exec_interpreter` now also forwards the `ToolchainInfo` provider. This is
+  for increased compatibility with the `RBE` setups where access to the `exec`
   configuration interpreter is needed.
 * (toolchains) Use the latest astrahl-sh toolchain release [20250317] for Python versions:
     * 3.9.21

python/private/py_exec_tools_info.bzl

@@ -44,14 +44,6 @@ This does not work correctly in case of RBE, please use exec_runtime instead.
 Once https://github.com/bazelbuild/bazel/issues/23620 is resolved this warning
 may be removed.
 :::
-""",
-        "exec_runtime": """
-:type: PyRuntimeInfo | None
-
-The forwarded {obj}`PyRuntimeInfo` field.
-
-:::{versionadded} VERSION_NEXT_FEATURE
-:::
 """,
         "precompiler": """
 :type: Target | None

python/private/py_exec_tools_toolchain.bzl

@@ -29,14 +29,10 @@ def _py_exec_tools_toolchain_impl(ctx):
     if SentinelInfo in ctx.attr.exec_interpreter:
         exec_interpreter = None
 
-    # Forward the provider fields from the toolchain itself.
-    exec_runtime = ctx.attr.exec_interpreter[platform_common.ToolchainInfo]
-
     return [
         platform_common.ToolchainInfo(
             exec_tools = PyExecToolsInfo(
                 exec_interpreter = exec_interpreter,
-                exec_runtime = exec_runtime,
                 precompiler = ctx.attr.precompiler,
             ),
             **extra_kwargs

python/uv/private/lock.bzl

@@ -107,7 +107,7 @@ def _lock_impl(ctx):
     args.add_all(ctx.attr.args)
 
     exec_tools = ctx.toolchains[EXEC_TOOLS_TOOLCHAIN_TYPE].exec_tools
-    runtime = exec_tools.exec_runtime.py3_runtime
+    runtime = exec_tools.exec_interpreter[platform_common.ToolchainInfo].py3_runtime
     python = runtime.interpreter or runtime.interpreter_path
     python_files = runtime.files
     args.add("--python", python)