[Bazel CI] Test Failure: The test //tests/exec_toolchain_matching:test_exec_matches_target_python_version fails due to exec/target version mismatch

CI: https://buildkite.com/bazel/bazel-at-head-plus-downstream/builds/5256#019c26da-74d1-4c54-b059-f5db2748e623

Platform: Ubuntu

Logs:

```
(04:14:44) FAIL: //tests/exec_toolchain_matching:test_exec_matches_target_python_version (Exit 1) (see /var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/5dbf842aae7b505a6f2030bfc609fac1/execroot/_main/bazel-out/k8-fastbuild/testlogs/tests/exec_toolchain_matching/test_exec_matches_target_python_version/test_attempts/attempt_1.log)
--
(04:14:44) [305 / 676] 163 / 539 tests; 30 actions, 24 running; last test: //tests/base_rules/py_test:test_explicit_main_cannot_be_ambiguous
Testing //tests/py_runtime_info:test_can_create_py_runtime_info_without_interpreter_version_info; 6s remote-cache, linux-sandbox
Testing //tests/multiple_inputs:multiple_requirements_in.test; 6s local, remote-cache
Testing //tests/pypi/requirements_files_by_platform:test_simple; 5s remote-cache, linux-sandbox
Testing //tests/base_rules/py_binary:test_tags_can_be_tuple; 2s remote-cache, linux-sandbox
Testing //tests/version:test_normalization; 2s remote-cache, linux-sandbox
(04:14:45) FAIL: //tests/exec_toolchain_matching:test_exec_matches_target_python_version (Exit 1) (see /var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/5dbf842aae7b505a6f2030bfc609fac1/execroot/_main/bazel-out/k8-fastbuild/testlogs/tests/exec_toolchain_matching/test_exec_matches_target_python_version/test_attempts/attempt_2.log)
(04:14:45) [311 / 676] 169 / 539 tests; 30 actions, 25 running; last test: //sphinxdocs/tests/sphinx_stardoc:bzl_providers_build_test
Testing //tests/py_runtime_info:test_can_create_py_runtime_info_without_interpreter_version_info; 7s remote-cache, linux-sandbox
(04:14:45) FAIL: //tests/exec_toolchain_matching:test_exec_matches_target_python_version (Exit 1) (see /var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/5dbf842aae7b505a6f2030bfc609fac1/execroot/_main/bazel-out/k8-fastbuild/testlogs/tests/exec_toolchain_matching/test_exec_matches_target_python_version/test.log)
 
FAILED: //tests/exec_toolchain_matching:test_exec_matches_target_python_version (Summary)
/var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/5dbf842aae7b505a6f2030bfc609fac1/execroot/_main/bazel-out/k8-fastbuild/testlogs/tests/exec_toolchain_matching/test_exec_matches_target_python_version/test.log

```

Culprit:

Steps:

git clone -v https://github.com/bazel-contrib/rules_python.git
git reset 39e9a3f2d7844128c7e78ad42f1e373ba8fa0a7a --hard
export USE_BAZEL_VERSION=0327100c98a126b9fc83223ba41303fe8b37d331
bazel build --keep_going --verbose_failures --build_tag_filters=-integration-test --lockfile_mode=off @rules_python//examples/wheel/...

CC Greenteam @kotlaja

記載されている git reset、USE_BAZEL_VERSION、bazel build コマンドを使って失敗を再現します。//tests/exec_toolchain_matching:test_exec_matches_target_python_version と、それが参照する test.log から始めて、exec と target のバージョンの不一致を特定します。テストが失敗しなくなり、記載されている wheel の例のビルドが正常に完了すれば完了です。

索引モデルが issue の本文から書いたものです。