Missing pip dependencies with venvs_site_packages=yes

# 🐞 bug report

### Affected Rule

The issue is caused by the rule: `py_test`

### Is this a regression?

No

### Description

Pip dependencies are missing for py_test targets.
1. Ex: `pytest` pip package depends on `py` pip package. Adding `pytest` to the `deps` for `py_test` doesn't include its transitive dependencies, e.g. `py` (and others). It does include some transitive dependencies though, e.g. `pluggy`
2. In the above example, adding `py` as an explicit dependency in `deps` fixes the problem as it gets included in the generated venv. However, this 'fix' doesn't work for `iniconfig`, another missing transitive dependency of `pytest` - it doesn't get included in the venv

## 🔬 Minimal Reproduction

## 🔥 Exception or Error

Traceback (most recent call last):                                                                                                                                                                                                          

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual_stage2_bootstrap.py", line 537, in                                                                                                                                                     

    main()                                                                                                                                                                                                                                  

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual_stage2_bootstrap.py", line 531, in main                                                                                                                                                        

    _run_py_path(main_filename, args=sys.argv[1:])                                                                                                                                                                                          

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual_stage2_bootstrap.py", line 319, in _run_py_path                                                                                                                                                

    runpy.run_path(main_filename, run_name="__main__")                                                                                                                                                                                      

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/execroot/_main/external/rules_python++python+python_3_10_x86_64-unknown-linux-gnu/lib/python3.10/runpy.py", line 289, in run_path     

    return _run_module_code(code, init_globals, run_name,                                                                                                                                                                                   

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/execroot/_main/external/rules_python++python+python_3_10_x86_64-unknown-linux-gnu/lib/python3.10/runpy.py", line 96, in _run_module_co

de                                                                                                                                                                                                                                          

    _run_code(code, mod_globals, init_globals,                                                                                                                                                                                              

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/execroot/_main/external/rules_python++python+python_3_10_x86_64-unknown-linux-gnu/lib/python3.10/runpy.py", line 86, in _run_code     

    exec(code, run_globals)                                                                                                                                                                                                                 

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/build_supp

ort/python/pytest_proxy.py", line 7, in                                                                                                                                                                                             

    from pytest import console_main                                                                                                                                                                                                         

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual.venv/lib/python3.10/site-packages/pytest/__init__.py", line 6, in                                                                                                                      

    from _pytest.assertion import register_assert_rewrite                                                                                                                                                                                   

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual.venv/lib/python3.10/site-packages/_pytest/assertion/__init__.py", line 9, in                                                                                                           

    from _pytest.assertion import rewrite                                                                                                                                                                                                   

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual.venv/lib/python3.10/site-packages/_pytest/assertion/rewrite.py", line 34, in                                                                                                           

    from _pytest.assertion import util

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual.venv/lib/python3.10/site-packages/_pytest/assertion/util.py", line 19, in 

    from _pytest.config import Config

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual.venv/lib/python3.10/site-packages/_pytest/config/__init__.py", line 45, in 

    from .findpaths import determine_setup

  File "/scratch/nikolay_nikolov/.cache/bazel/_bazel_nikolay_nikolov/79bf5e678fbb2019f1e30944a206f079/sandbox/linux-sandbox/890/execroot/_main/bazel-out/k8-opt/bin/barrel/core/common/logger/logger_tests_py_test.runfiles/_main/barrel/cor

e/common/logger/_logger_tests_py_test_actual.venv/lib/python3.10/site-packages/_pytest/config/findpaths.py", line 12, in 

    import iniconfig

ModuleNotFoundError: No module named 'iniconfig'

## 🌍 Your Environment

**Operating System:**

  

No LSB modules are available.

Distributor ID: Debian

Description:    Debian GNU/Linux 13 (trixie)

Release:        13

Codename:       trixie

  

**Output of `bazel version`:**

  

Build label: 8.3.1

Build target: @@//src/main/java/com/google/devtools/build/lib/bazel:BazelServer

Build time: Mon Jun 30 16:23:40 2025 (1751300620)

Build timestamp: 1751300620

Build timestamp as int: 1751300620

  

**Rules_python version:**

  

1.9.0

  

**Anything else relevant?**

No

Bắt đầu với rule py_test và tái hiện lỗi logger_tests_py_test được mô tả trong traceback, sử dụng venvs_site_packages=yes. Kiểm tra môi trường ảo được tạo và cách xử lý dependency cho pytest, py, pluggy và iniconfig; issue được hoàn tất khi các package bắc cầu mà pytest yêu cầu luôn hiện diện nhất quán và target chạy thành công.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.